Butch Barry may suck, he may not. It's pretty hard to tell with the playcalling, scheme, and the players he has under his tutelage. I think Barry is gone but I also think unless the team goes out and picks up 1 of a handful available truly proven offensive line coaches the difference next year will be minimal.
The most experienced lineman at Miami is Tommy Kennedy (3rd string senior Richt brought in). Followed by overweight and regressing Donaldson (starting Junior) . Gaynor has the next most starting time then Traore (2nd string Sophomore who played JUCO). Nelson and Clark were never planned to be starters by anyone. Campbell (redshirt freshman) was awful at right tackle but might be able to play guard.
Teams that start true freshmen or redshirt freshmen on the offensive line usually have redshirt juniors and redshirt seniors surrounding them and backing them up. At Miami the worst players are apparently the oldest and most experienced and struggle to be in the 2 deep. It's a very messed up situation. Hillery, Kennedy, and Herbert have all looked terrible, so the coaches go to the young guys who have little experience, 0-2 years of strength training, minimal development, and who struggle recognizing stunts or knowing who to block.
No one wants to hear it but Mahoney leaving, Boulware going "pro", guys like Reed quitting the team, and guys like Milo (left), Hillery, Kennedy, and Herbert being god awful has really hurt this program. The staff also failed to get guys to transfer here like Parker Braun (All ACC guard from GT). Thats 7 players who can't be relied on today who should be in the 2 deep competing for starting time consistently.
At some point fans need to realize the next shiny offensive line coach or highly rated freshman isn't the savior. This program needs to get to the point of starting fully developed Juniors and Seniors on the offensive line and bringing in young players slowly to take over a spot early if they can. The team needs to be able to develop the players they take at the very least to be average - and this program has been a massive failure at that for years now. Gaynor might be the only success story today of taking the time and developing an offensive lineman to eventually start and it's not like he's amazing.