Nobody involved ever actually suggested Sasha moved to Plushenko because of Rozanov, it was speculation. From what Aliona has said it seems she is the one who moved to Plushenko because of Rozanov and he is working mostly with her.
Ah, I must've gotten them mixed up then. My mistake.
Sergei has posted a video of Sasha's 4Lz on his Instagram recently, so I'm guessing she still works with him but he's probably not one of her main coaches. He seems to be the main coach for Alena and Veronika, so he's probably putting most of his time into their training.

