I rewatched the 2017 ND game recently and 55 was mauling dudes. I think fans forget how good he was before the injury and weight issues. I know I forgot how solid the run game execution was on that team. Not a huge surprise considering Thomas Brown is now being groomed as an NFL HC candidate.
Scaife made a lot of mental errors but part of his issues stem from playing inside where the physical aspect of the game is more extreme and happens quicker on a down-to-down basis. I don't know if that will just fix itself with experience but I've seen Alex Cappa shift from LT to RG in the NFL, struggle with that aspect then play well in his 2nd year.