No doubt pressure is an issue, but I agree that pro athletes need to be ready to deal with this.
Also, Gibbs always "brags on" the character of his players. Clearly, one important character trait is dealing with big money. Coles, Portis, Washington, Griffen--they did it. AA and Carter (who is clearly adapting) need to step up and do the things they are physically capable of doing (maybe AA isn't physically capable--another theory
). Not that anyone is denying this obvious truism.
On the bright side, Carter shows that pressure can be handled. If you can't physically do things, then there's no solution.