Unless sexual assault was in play, this is maybe the most ridiculous story I've ever heard.

Could such a move happen without consent from Brown and Tatum? Absolutely not. Were they involved in a mutiny? There's a very good chance:

Speculations:

Tatum: still resistant on Ime's defensive system. More energy exerted which leads chance of injury and/or breakdown late in season and/or not as much accolades

Brown: Maybe upset about KD rumors.