No.
It is a case-to-case scenario. One would be a fool to lose a strong attacking initiative or an important tactical opportunity just to castle for the sake of castling.
True.
I think kurogkug is asking wether Kasparov has a weakness, and if that weakness reveals itself when he can't castle.
I wouldn't think Kasparov has any weakness.
BTW, here's an interesting short interview:
http://www.youtube.com/watch?v=B2KKfOGaR_w
No.
It is a case-to-case scenario. One would be a fool to lose a strong attacking initiative or an important tactical opportunity just to castle for the sake of castling.