Utah, USC, UW, and Tennessee all return some interior OL.
Utah returns starting C and OG (plus an OT); USC returns a 2-year starter at RG and two C/OG players who played a significant amount of snaps (plus an OT); UW returns their entire OL, including starting RG, 2-year OL starter (RG in 2017 and C in 2018), and 1.5-year starting LG (plus both OT); Tenn returns three part-time starters at RG (one started 2 games in 2017, the others split time last year), their starter at LG, their starting C and another player coming back from injury who started last season as the starting C (plus two OT with starting experience of 5 or 6 games and another full-time starter at OT if his lung issue is medically cleared).
If UW pushed you around last year, they'll do it again. Utah's OL will probably be worse than last year's, at least early, but they can't play much worse than they did last year. USC's might be worse, that team is a huge ?. Tennessee returns a LOT of talent and experience, it will depend entirely on coaching.