Dude got cocky when he made the pro bowl. He’s been poor since then.
Maybe cocky.
IMO, more likely the opposite - he just got more uptight.
When he first came in, he was just a guy from a nothing league making it into the NFL. Just being here was a victory. "I'm here, just play."
Once he started to play well, and especially get selected to the Pro Bowl, the expectations shift and now he had a higher status to *lose*.
"Can I keep it up? Have I just gotten lucky? Will it all come crashing down on me?"
I remember back in the 90s when the Cowboys used to actually win things that mattered. Climbing the mountain was just an entirely different vibe for the team than trying to stay on top of the mountain. Expectations of victory and playing not to lose are just a much harder context to play well in. Much less fun too.