So I am going to give you some hope. That appears to be his winter coat (notice color difference to other buck). I have seen some pretty bad looking deer in that coat turn out just fine in the fall.
I didnt look back but I always had it in my mind that Chief was a long deer. That one doesn't look long. Also, probably based on posture in that photo, but there is no sag whatsoever. A 9 or 10 year old deer should have some back sag. The front shoulder is hard to judge. On one hand, it doesnt look very big at all, but then it is in poor shape from the winter. Put some muscle on it and that changes everything. After my scientific analysis, there is a 46.784621% chance that is Chief.