Stokes didn't regress. He just hasn't progressed enough to take on double teams, which he didn't face last year. Not having Maymon is really hurting Stokes and the team on offense in the low post.
Trae just seems to be in his own head in big games and big moments. He hasn't been able to handle the pressure of those moments well. I feel bad for the guy cause there have been plenty of games that he's play well in.