When I went to MD Anderson for my cancer. I was told not to get hung up on staging. Miracles happen, people are all different. There is nobody on this board that can answer your question for certain since none of us know the situation.
All I can say is. Make darn sure you are in the right place, with the right doctor and put your trust in them. For me, I put even more trust in the lord. I know not all people go along w/ that, but it worked for me.
I know you want answers, but so much of this is based on his progress, his strength, etc. Just hang in there and don't be afriad to lean on those on this board. It's a great place to get moral support and suggestions.
Good luck and God bless.
Rick