I'm not sure its his back that is ailing him now. It certainly may be, but what I have seen is his stride isn't what it used to be. His right leg doesn't seem to have the push it used to. Lou Nanne commented the same thing on Barriero's show yesterday.
It certainly could be his back, but he had a knee injury last year that he tried to play through and had a "lower body" earlier this year that some said was the result of blocking a shot.
I really don't think playing in the World Cup was a good idea for him. He has missed so many games the last few years only to add a few more on top of it? Not a wise choice.
Correct, that is how I understand it. The front end he could be getting something like $13M salary and the backend $5M, but it will all average out over the term (13 years) which results in the cap hit of $7.5M.