I'm not dissing on Onwenu, but ...
Peter Skoronski
Quinn Meinerz
Quenten Nelson
Joe Thuney
Grey Zabel
Trey Smith
Chris Lindstrom
Tyler Smith
Alijah Vera-Tucker
Sam Cosmi
That's 10 I would take over Onwenu.
Onwenu is an above-average RG with limited range. He is not a first tier IOL, or a foundational player.
Skoronki was slightly worse against the Pass rush last year
Zabel allowed 2 sacks, 4 QB hits, and 18 hurries on 553 pass blocking snaps. That's 1 pressure every 23 snaps Worse than Onwenu.
Lindstrom was WAY worse than Onwenu against the pass rush.
Sam Cosmi was injured a good portion of the year, taking only 545 snaps in total. He had 325 pass blocking snaps. He allowed 2 sacks and 9 hurries. That's 11 pressures on 325 snaps or 1 pressure every 29.5 snaps. Which was slightly worse than Onwenu.
Trey Smith 1 sack, 2 QB Hits, and 1 Hurries on 459 pass blocking snaps. That's 1 pressure every 28.7 snaps.
Quinn Meinerz allowed 2 sacks, 5 QB Hits and 18 hurries on 709 pass blocking snaps. 1 pressure every 28.4 snaps.
Tyler Smith? 3 sacks and 23 hurries on 700 pass blocking snaps. That's 1 pressure every 27 snaps. Worse than Onwenu.
Of the list, only Quentin Nelson and Joe Thuney were better than Onwenu against the Pass rush.
Onwenu's "limited range" is only a factor when asking him to pull for outside runs.
I'm one of Onwenu's biggest supporters and I haven't said he was ELITE. There are only 3 ELITE pass blocking Guards currently. Thuney, Nelson and Damione Lewis. Onwenu is, however, 2nd tier and the top of that tier.