Ironically, Krall is at Skate Canada at the moment with her student, Joshua Farris who had the second to last TES in the SP by messing up several jumps. Can we then infer Josh Farris doesn't have a real coach because he is not landing those jumps?
Another interesting factoid is that Patrick Chan's PCS has really skyrocketed under Kathy Johnson's influence. His PCS have become not only higher but they are also somewhat consistent across competitions, whether it's good skate or bad. That's actually quite a bit more valuable to a skater strategically given how variable TES can be.
As far as Chan's jumps are concerned, they are fine. The quality of his jumps have not significantly changed over the past few years, he still get very good GOE when he lands them. As for errors, men's skating seems to be going through a period where we are seeing more and more mistakes, likely due to increased risk taking. Some of it seem to be psychological. In any event, it is unlikely that any "technical coach" can do much about this.
Finally, skaters will assemble a team that they feel most comfortable with. Kathy Johnson being Patrick Chan's girlfriend's mother may seem like an awkward or uncomfortable choice for some - just imagine how some people cringe when the word "mother-in-law" is mentioned. The fact is, everyone is different. Some skaters are coached by parents or siblings and some others want nothing but completely unrelated people on their coaching team. Hard to say there is one formula that works for everyone.
There are benefits to surround yourself with independent advisors as well as having people who are emotionally invested in you. When you look at Hanyu, who sacrificed his comfortable entourage in Japan to move to Canada to live and train with 2 respected independent advisors - not sure it's working out for him. Many people have remarked that he seemed to have regressed so far compared to last season - a somewhat shocking development considering at his young age, he should progress not regress. Midori Ito's coach, Machiko Yamada, was practically her 2nd mother. Ito lived with her coach & family since she was a child. After she started to show incredible talent, many U.S. coaches have invited her to go train in the U.S., something she knew was not going to happen. I can't imagine Ito doing well leaving her comfortable entourage and go to the U.S. Asada tried to train with foreign coaches abroad, it really didn't work well for her and being homesick is cited as an issue.
It seems to me, if some people are keen to find fault with Patrick Chan, there is really no lack of excuse in order to camouflage from the hater label.
Who knows who the next target will be when Patrick retires. Will see. 
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