He has reinjured the knee several times it seems to me. I think because of his attitude he was rushed back, no fault to the doctors or staff. He is a warrior and he would want to play the whole game.
I would let him run the first play and then out. This kid has given way too much to destroy his pro career. You all know how I feel about pro football, but this kids deserves a chance at that level. Set him the rest of the year, let him hit the combine fully healed and on killer mode.
I know that will never happen, because Rex is a full red blooded Husker. He will say he is fine no matter the cost to play on Senior day. I love what this kid has brought to the program, it is time for adult guidance and concern. Tough thing for Bo to do, he knows what a warrior Rex is, but he needs to get something out of the effort at the next level. Let him make some money and retire at Nebraska coaching running backs.
My prayers will be with him no matter what happens. I just do not believe he is ready to play and won't be for another two or three months.
I have had knee problems my whole life, they very seldom heal right and will always cause him problems.