Fragile ego is a perfect way to describe it. Some of us have been claiming that for years now.
I think it would be fair to say that Wilson is a complex person, and Carroll handled him perfectly. He's someone needs to be praised on every move that he made, only thing unlimited about Russ is his insecurity, Pete openly praised him and never criticized him, Pete probably encouraged coaches and teammates to do so. When some teammates wouldn't play along, they were traded or released. I joked in the past years that Pete sold his soul to Wilson, but that's the only way for Russ to function.
Hackett may be a better XO guy than Carroll, Hackett do not know how to coach Wilson.
Russ is not unlike Sea Biscuits, a very fast horse. Under his first trainer, a multiple triple winning trainer, Sea Biscuits refused to run in the morning, when pushed, he bite the trainers and jockeys. With his second trainer, a cowboy, Sea Biscuits got a double sized stable, in came an old mare, a monkey, some birds, etc., Sea Biscuits slept laying down, and till noon. With that he started winning. Sea Biscuits was a weirdo, with mama and loneliness issues. Russ's the same way.