when i take a step up in repertoire (in terms of difficulty) i usually get back pains. my teacher used to say that because I am not used to the practice length and difficulty of these pieces, my back muscles arent used to it either and will find it a strain. i think its more a matter of learning to relax all over again at each level of difficulty. i am not going to say whether he is or isnt ready for la camp, but i will say that everyone finds some sort of pain or difficulty when stepping up a level in repertoire, and that pain just needs to be worked on and eradicated. if every time people say he is not ready, when in pain, he wont get anywhere. we all have to work on something that is technically straining, otherwise we wouldnt get any better at the piano. however a line needs to be drawn where this person is simply not ready, but we cant possibly do that when we havent seen him attempt this piece or play other pieces.