First let me say that the bodycam footage to this day hasn't been released. Until it is, I give very little weight to the claims made by police. In fact this should be a rule: bodycam footage should be required for serving all warrants, arresting any suspect and so on. The police simply have too much power that can be abused and video footage (bodycam and amateur) has many times exposed the police lying.
Kemp at least was the subject of the warrant. I'm not saying this to justify excessive police violence. But it is a key difference.
As for what happened during the raid, it's hard to make conclusions since we don't have the bodycam footage.