I think the difference in waiting duration between the surgeons, is the time to wait for the nerve to heal itself. Some surgeons prefer to wait a year, while Boahene wants to make a decision quicker than six months. I think the thought is if you are NOT seeing ANY improvement after this time then it will probably not happen. There are always exceptions to this rule, and people have reported improvement after 1-2 years. I haven't seen any statistical valid analysis but I think it would be safe to assume your odds go down after six months
I had the cross facial graft and trigeminal (jaw) graft. So far only the trigeminal nerve graft worked (so I need to bite to smile). In the end, no guarantees with this stuff.
Also, go see one of the optomologists at Hopkins. Boahene is amazing but you want someone to look closer at the eye.