It’s called “the yips” and some of the best in the game get it.
Steve Sax, Chuck Knoblauch, Rick Ankiel, Dontrelle Willis, John Lester - all of them All-Stars at one point in their careers - have had it.
It’s a mental block that doesn’t show up until the spotlight is on (in some cases after being super successful at the same task thousands of times) and really what is needed is a sports psychologist.
But I digress, catching a football is part mental and part physical, and when the pressure is so much that you can’t mess up without coming out of the game or being chewed out beyond belief, the result is usually a drop. It’s just like playing not to lose or thinking to hard about a route, block, etc.
CCS and staff have made this a tough environment for guys that were used to a more laxed, “pick you up when you fall” environment of the xCWT regime.