i think kyle knows she transferred into violas body, if you look at his drawing and viola ...

maybe he was yandere stalking her before

Or, it’s that he’s Roachbinas lackey. And he sees it as she’s roachbinas connection. Like they need to be intertwined. Think about it, without Viola, Robina wouldn’t be as pitied as she is now. She used Viola to push the “victim who forgives the tormentor” narrative. That’s why despite all “the bad” Viola did, she could never let her go publicly because without her. She’s nothing. It was smart honestly, keeping her mule close yet far enough that she can’t wake up.