I've been watching a bunch of Fangupo's games (10) and it's still difficult to place him, partly because of the injury.
Early in the season, he was new to the system and didn't start the first 3 games.
Then he injured his ankle after one or two plays in game 5 against Utah St.
He played in game 6 but was injured again (same left ankle) in game 7 against Oregon St. (after about 9 snaps). He was inactive in game 8 against Idaho.
He came back against TCU and played pretty well after the first two series when he looked a little tentative.
Against the next 3 opponents, he played less than 1/2 the snaps (due to the rotation and a big lead).
I don't think he ever played more than 1/2 the game in any of those 10 games .
He looked better in the limited time at NT.
But then again, he did line up against some pretty good RT (some were drafted and some were signed as UDFA), and perhaps the Centers are usually smaller and don't quite have the arm length of the OTs ???
I am a BYU fan and watched all the games. I wouldn't take Fangupo lake of penetration/sacks against him much. BYU's 3-4 scheme is for the linebackers and safeties to make plays. The D-line is to force people outside and occupy blockers. As a run-stopping NT he should be effective- but if he does more than that I will be surprised.