Your assessment of OL play is....bad. Yosh isn't the worst LT in football. he is probably about 20. Yes, big downgrade, but he also may have improved for a 3rd straight year and be more like 12-15. Jenkins is elite. Runyan is top 25 (2 starting guards per team). Tom, unless he regresses is honestly a flat out stud. Myers isn't a JAG, its just that most people have no idea to watch blocking at the 2nd level, which he is elite at. A lot of nice Jones runs happened because Myers cut down the pursuit ILB. He does need to improve vs. the bull.
When I say still top 10, I mean about 10-12 to be honest. They can't be inside that without Bak. One thing I can say with certainty is that Yosh gets paid next year. By us or someone else....unless he regresses.
Remember, Yosh played a ton of snaps at LT and those lines still graded out pretty well.