Whitworth's comments earlier this year about this being his last year IMO comes after the FO gave him the courtesy of letting him know they plan to move on with Noteboom. It's his time, but they would be remiss if they did not make him an OL assistant coach given how he's been mentoring so many of them.
The more I listen to McVay I think they are hoping that Rob is serviceable through this season and next to garner them Snead's coveted comp picks. This will give them 2 years to develop A. Jack into his successor. A. Jack's forte is in run blocking though he was solid in the preseason as a pass blocker. You want a run-blocking OT on the right side.
Perhaps you haven't noticed but Stafford has had less pressure than most if not all the other NFL QBs. That is not by accident. Improved blocking techniques (coaching) and the most overlooked factor is better in-game blocking calls by the center. Allen's blocking calls have been pretty much on spot. That was a huge weakness of Blythe along with his poor blocking. It's exactly why Allen was promoted to starting center over Corbett. It was Corbett's achilles heel in Cleveland and why he was benched. It's the hardest part of being a center. In pass protection, blocking is secondary to getting the calls right. Allen's ability to get those calls right (proven over the last 3 games against good D front 7), his ability to take on one on one blocks, and his mobility to make second-level blocks in the run game have validated his promotion.
People denigrate his 2019 play, but in those 9 games, Allen outplayed Blythe. He got benched by Kromer, not because of his play. I have no doubt that Carberry was in McVay's ear about the issues with Corbett, but Sean's ego wouldn't make the change until he saw it for himself in Vegas. It is no secret that Corbett's inability to make the correct calls were why he was abruptly moved back to RG. It's why I've always contended Allen was their best option at the position. It's also clear by their carrying Shelton that he's their #2 center. If they want Corbett to be a serviceable center he's going to need a lot of off-season work. But Allen's performance thus far makes that highly unlikely.