A bad hold is not the kicker's fault.
Crosby actually has an instructional video out on how to kick, based on what I saw there he seems to know the mechanics of kicking to (step plant kick).
Actually most teams (ours included) will simulate kick defense.
Kickers have one job, get the ball between the uprights. They practice it all week. When a kicker is called in to the game, he is expected to make the kick. A kick that usually ends up deciding the game. But he only gets one shot at it. It is his only job, and the fans know it. He is only out there because the offense couldn't score. The fans and the team are putting all their hopes on him to make this kick so they can say the drive did not end in failure. If he misses, the other team gets the ball with great field position. He will have let the fans and the team down. Especially the defense. His only job is to make that kick, and that job, his entire livelihood, hangs on whether or not he makes this kick. And he knows all of this. I'd say kicking is a good bit mental.I'd even say that kickers have more pressure put on them than the quarterback.
Even if it is mental, it does not necessarily mean you do not know what is wrong. Lets say he was flinching just before the kick, he is not, but lets pretend he is, he would probably be aware of that.
I agree that another Kicker should be brought in. In the offseason. I'm not going to risk his mental state any further this year knowing that it could cause him to completely break down mentally. Besides that the other kicker would not tell Crosby what was was wrong anyway because he would want the starting Kicker job for himself. Give him some solid competition in the offseason and let whatever happens, happen.