I don't think it's that bad. Bouhanni gets baulked by his own leadout man, and has to slow and go left to get around his back wheel, as he comes across he bumps Stewart and is knocked slightly off balance, and leans into him. Definitely a disqualification but I've seen much worse.
You talking about the first incident or second? I was mentioning the first, which is what I'd call part of sprinting. The second, pushing jake over onto barriers, isn't.
No. What you see is at the start Bouhani not on his teammate wheel and trying to push jake off.