How long does it take to come back from an amputated finger? Not sure why he won't be ready week 1.
I don't know, but any kind of a serious cut like that, with any kind of raised heart rate, throbs like all hell for a good couple of months. Any pressure on that area will take a lot longer. Now, maybe they put a hard cast around it, but not using that hand will be a big detriment to his game and using a club move with that hand would be out of the question for a good long while.
This is my non-professional opinion, of course.
I am very smart though.