I'm just going to say it again, they're not rebuilding the offensive line in free agency. They'll be fortunate to get one starter before the draft, and even that, I'd be fairly surprised to see.
But okay, let's say they sign at least 2 OL, the only thing I'd be okay with taking in round 1 other than OL is a pass rusher. Even then, I'd rather they trade down if they feel any OL available is too far a reach, and again, I'd happily reach in R1 for OL (hell, every round).
Darnold is the most significant player this franchise has had since Broadway Joe. The most important thing for him is to be upright because we've seen what he can do with even a modest amount of time to throw.
Draft offensive line early and often.