Bottom 10 is very harsh.
I think Tom had his struggles but fared quite well as a rookie, and he's put on 10-15 pounds of muscle.

Myers isn't awful, but thus far he's been a lesser player on a very good OL Njiman is a meh-level starter, a good swing tackle. He's not a liability, but he's not a franchise guy either. PFF had him at 63.1 last year at T, they had Zach Tom at 68.3. I think 60 is league average?
FWIW, Myers was 60.4, Runyan 62.6, Jenkins 72.3, Newman 57.5.

Bakhtiari was 79.8 - so he and Jenkins graded out as the best OL, and Tom was the next closest. You can quibble about PFF grades, but my eyes (and other scouting web resources) generally agree.

The OL improved as Jenkins and Bakhtiari got healthier and settled in at their positions, and the OL shifted around less. The first 2-3 games the OL did not play well, but you also had Newman and Hanson taking meaningful snaps and players playing out of their main position.
I would expect better OL performance from the get-go this year, APRH.