You can't teach nastiness. Sure Trent may put on a bit of a performance and pretend to be "nasty" for MacLean and the scouts, but bottom line he's timid. Put him in a situation that's he's uncomfortable with and he shrinks rather than rising to it. An aggresive 6'8" player intimidates Trent.
I wish Trent the best, and maybe something will spark in Trent so he becomes a much more dominant player, but nastiness can't be taught. It comes from inside, it comes from a hunger to want to prove yourself, to win. Trent grew up his whole life being "the best," so proving himself isn't ingrained in him. He's never had to do it. He's never had to work for it. He's never had to earn respect on the court. He's not like other ball players where they grew up on the streets playing ball, competeing for that one golden ticket to the pros. Such players poured everything they had into ball and no one was going to get in their way.
Trent grew up in the subarbs, the tallest, most athletic kid on his team. Everything was handed to him. Some players realize such, so seek to prove otherwise. Hopefully Trent is doing that now, but I wish he would have started on it two years ago (serving a mission would have helped). Starting his freshman year just reinforced in Trent he was entitled to success.