I'm not sure if this will be interesting, but I thought that I could write my thoughts about this matter as a Yuna fan and to put here what I think based on my observations.
1) First of all this splitting are really shocking news for all Yuna's fans. We all know that Brian Orser not only was a great coach, but also had a very friendly and special relationship with her that helped her very much to become a "happy skater" we all know. We have respect towards him and we came to love him through Yuna. In Korea he was a star on his own, he published his book there and he is a honorary citizen of Seoul.
It would be surprisingly enough if they just announced their split and simply wish good luck to each other. But what was worse is the way how it was done. Cruel words towards each other, Brian's persistence with interviews and Yuna's mental state falling down... This was like a nightmare and a lot of people were extremely confused. It was impossible to say who was right or wrong, because we couldn't imagine Yuna without Brian and Brian without Yuna.
2) We don't know what is the cause for this split. Personally, I can't even imagine what was the cause. Some people recall the "Mao Asada" rumor back in May. But Yuna and Brian had such a good relationship, that even if he had agreed to coach Mao, I don't believe it would turn like this. That's my personal impression. And I still have it.
3) Some people would say, that "The dream team" never existed and how good was that relationship was exaggerated by the press. I would disagree with this. I do believe that Yuna and Brian had almost perfect relationship. There was just too many beautiful things between them to count. Said that, I don't mean that there wasn't a single problem between them during 4 years. Even the best teams have problems sometimes and, in fact, we knew that those problems existed, but apparently they were solved easily and weren't anything important. On the other hand, we don't know all the details, so obviously we don't know some things.
4) There are several theories about what could gone wrong. In my opinion no one of them is fully credible because we simply don't have enough information. Most likely, what happened was a series of unfortunate miscommunications which finally led to a problem that they couldn't solve. While talking about the cause, I would like to accentuate that they really had a very special relationship and you can see this by the strong sentiments they both expressed during those days. They were both personally offended and deeply hurt by the actions of each other. And the cause of their split can very big, or can be very little. You know, sometimes even the strong bounded families split up because of little, stupid causes. That could happen here as well. And as we don't form the part of that very special "Yuna team", it's possible that we could not understand this cause at all even if we would hear it.
5) The management of ATS was considered as horrible not only by casual skating fans, but by the wast majority of Yuna's fans as well. That was a known fact. A long time ago we had enough complains about Helen Choi, an infamous Yuna's PA and translator. Ask prettykeys if you don't believe me. I have no idea why they keep this woman around.
6) Brian's actions were way too cruel to Yuna. I don't think he planned this or made this on purpose in order to sabotage her show. I think he was really hurt and wasn't thinking what he was doing. While it's OK to express your sentiments, he made a lot of ugly remarks and accusations and kept doing interviews even after it was clear that he hurts Yuna by doing so. His remarks about how much he gains were contradictory with his phrase that money doesn't matter to him. He said, that he cared about Yuna, but suggested her to leave the Cricket club and did nothing even when she was crying inside his Club. No matter how hurt he was and even if she really was that cold and disrespectful to him as he claims, it was not normal and, honestly, it looked like he went on a revenge against her. His remarks that this can a valuable experience for her are ridiculous. Yuna already had bad experiences with her previous coach and nothing she can learn from this, besides how cruelly stupid Brian Orser can be. Finally it was unethical to publish the private correspondence (even if it was one-sided) and disclose her music for the LP. This, in fact, hurts Brian in the long run more than Yuna. Skaters who will consider Brian as coach will have to think if he will do this for them as well.
7) Yuna herself didn't handle really well this matter. She went on attacking Brian using Twitter probably wanting hurt him as well. However we should consider her emotional state and that she, most likely, regretted doing so. According to Brian she herself was disrespectful to him, but she denied this, and as there is no third party to confirm or to deny anything, we have to give her benefit of the doubt.
8) ATS doesn't want to disclose the reason behind this and we can't demand for those reasons. We can say that Brian was like a part of family to Yuna and Yuna is known for not talking publicly about the personal matters. That's why there is very few information about her family. What really happened between them should stay between them. Consider this as completely private matter, and not business matter. This is something that they both agree about.
9) In spite of all this Brian Orser is a skating legend and, probably, good person. I believe that he was just too shocked and was unable to think clearly about what he is doing. He played a great role in Yuna's success being almost a father for her and really deeply invested in her.
10) We all know that Yuna is a good person and a great skater. She made Brian Orser into a coach and completed him as much as he completed her. I hope that this incident won't change your opinion about Yuna.
11) There is an implication that Yuna may be controlled by her mother and that all key decisions are done by her mother. I would like to say, that long ago, I, as a fan, was interesting in this. As I understand, Yuna's mother doesn't control her and, in fact, she is just primarily thinking about her daughter, therefore, she is not even pushing her to skate or to go to next Olympics, as Brian seemed to imply at one instance. In fact, Yuna is known to be pretty independent and even stubborn from the young age and sometimes this stubbornness caused arguments between her and her mother. So she is unlikely to be controlled.
12) This all was really hard for me and affected me very negatively. I can't express how I wish this would never happen. I'll try to respect Brian and I hope that eventually they'll come to some peace between them. What I'm sure about is that there won't be a better coach for Yuna than Brian was. Regardless if you believe Brian or not about ATS being so unprofessional to him, I have to remind that we don't know the truth and, most likely, both of them had a lot of errors and faults. I firmly believe that something wrong happened. So I hope that all of us will eventually desire them the best and try not to see them more negative than before. After all, both of them could be wrong or, maybe, both could be right in the case, that it was a purely miscommunication problem. Can you imagine that all happened because of translation problems and both of them acted logically and according to the information they had? I hope you will be open-minded and consider every possibility without making judgements upon something we don't have enough information about.
Thank you very much for reading.