If I remember right, Onwenu’s difficulties (though he was still mostly fine) at LG seemed to have a lot to do with being on the left of the line versus being used to being on the right when he was the RT. Possibly going to RG would be simpler for him since it’s still on the right?
IMO - they should pay Brown. Yes he’s had injury issues but so has Wynn and Wynn’s contract is due next year, and Wynn does not measure up to Brown. Pay Brown and make him your LT for the next couple years at least, trade for Collins to be your RT, make Onwenu your Mason replacement and figure out LG, maybe give Wynn a try and if he doesn’t work out then you trade him at the deadline or you just keep him as a reserve LT for the year (though an expensive one). Then you can focus on WRs, DBs and defensive line in the draft.
Onwenu played LG, RG, and RT as a Rookie.
LG - 112 snaps - 3 pressures, 3 hurries
RG - 185 snaps - 1 hurry, 1 pressure
RT - 616 snaps - 3 sacks, 5 hurries., 8 pressures.
Note: He played multiple positions against Denver, LAC, and Buffalo. I didn't have time to do a deep dive into what he gave up where in those games.
Sophomore: LG/RT
LG: 290 snaps - 2 sacks, 2 hits, 3 hurries, 7 pressures
RT: 276 snaps - 2 hits, 2 hurries,. 4 pressures.
I think the biggest problem that Onwenu has is that the Pats haven't kept him at one spot. His first "bad" game at LG last season was against TB. Then he was mediocre against the Chargers while playing RT. He then ended the season with a bad game run-blocking against Jax when he saw 30 snaps back at LG. He saw 10 snaps at LG against Miami and his pass blocking was trash that game.
His most snaps have been at RT. His least at RG.
Total:
LG - 402 snaps - 2 sacks, 2 hits, 6 hurries, 10 pressures.
RT - 892 snaps - 3 sacks, 2 hits, 7 hurries, 12 pressures.
I said it before and will say it again. Stick him at a position and leave him there. With Mason gone, you need to build around Onwenu and Andrews. But they need something more than Patricia/Yates for the O-Line Coaching.. Without that, then it won't matter who they have for players. Patricia = Gugs PT 2, imho.