Specifically being cleared to play with a significant knee injury and having his knee subluxed several times in practice before the bowl game, and trying to play in the bowl game and not being effective. Then having them advise surgery.
As far as Taysom, his injuries were season ending so it's not like the Byu staff had him continue to play, although I do wonder about the no risk of further injury at Nebraska. He had suffered the Lis Franc, but the amount of displacement varies in that injury, so in theory I would think it's possible to further damage or displacement in the foot? Maybe it's a moot point since it was still season ending and going to require surgery.