Kustarova is a junior skaters coach, her students have a hard time transitioning into seniors
doesn't mean great juniors you'll be great technicians in seniors
Wrong. If you are great in juniors, overall great, it doesn't mean that you will be great in seniors, because having low expression and dance abilities can't be excused in seniors, while in juniors it is still like - he/she will learn it, look at Bukin, for example.
But having great technique only = deep edges and good knee's work - this is the same for both juniors and seniors. The elements in Ice Dance are almost equal in junior and seniors, in past years there was just one lift more and 30 seconds longer ffor senior free program....so your notice is wrong.
Bobrova & Soloviev left juniors in 2006/07 season, and Sinitsina & Zhiganshin in 2011/12 season. If you are ready to start a discussion that B&S are still juniors for last 7 years...I don't know if somebody will every take you seriously in any way.
Kustarova students have a hard time in technique in seniors? How did you explore this? B&S winning two silver medals at European Champs and wining senior Grand Prix under Kustarova are "having hard times"? Yes, they had trouble with packaging and costumes and make-up and they were not always clean, but this is all something else then technique.
Sinitsina & Zhiganshin 4th place at European Champs and 7th place at World Champs is "having hard times"?
I would kindly announce you that whole career of very talented I&K, the couple who Russian Federation took like the Gods on the ice - have silver medals only also, no Gold medal at European Champs, no Grand Prix win, no World Champs medal. And by the way I&K results at their first senior year was exactly the same like Sinitsina & Zhiganshin's results this year (taking Nationals, European and World Champs). So what are you talking about???