I think the reality is that Purdy is still learning the game, and teams have studied his reactions to field situations. They've learned how to neutralize some of it. When that happens, a player's game can take a turn, and not for the better. Now, it's up to the coaching staff to help him get his swagger back, and put what happened behind him. Some can, some can't.
The biggest problem is that sometimes what we think we see as great talent is more a product of how others treat the situation, and respond. In Purdy's case, he's had a darned good surrounding cast to succeed. It's still there, it's in them, and now we're going to find out if what happened was an anomaly, or if the real player within has actually been exposed.
Because these things can, and do happen, I learned a long time ago to temper my judgement on how good or bad a player is, until after they've really learned the system, and been put in a real position where they can pass or fail.
Purdy is about to learn first hand, what he really has to offer. Next week will tell a lot about what he actually has to offer.
But, that's just my opinion.