I agree that we have one of the best OL's in the league, with Karras first off the bench. Ferentz is now active and the 7th OL.
===========
I disagree with the idea that we have quality depth beyond the obvious six.
TACKLE
Cajuste, Herron, Cunningham
Maybe one of them is capable of being the Active swing tackle. More likely, Belichick would have to move Onwenu to RT if there were an injury. This is not what we should want at a general plan, especially with a player in his second year.
GUARD/CENTER
We have Karras, fine depth.
Usually, we have 3 backups for these two positions. The depth was so bad that we needed to sign Ferentz and Redmond to compete with Sherman, Redmond, Toran, and Martin
BOTTOM LINE
I'm glad to see Ferentz signed. We NEED him as our 7th OL. That how good our depth is. Ferentz isn't a lock, but he is close, especially if we are carrying 9 OL's as is likely under the new rules.
PICK TWO (after our starters, Karras and Ferentz)
Redmond, Cajuste, Herron, Cunningham, Sherman, Toran, Martin
Hopefully, both Herron and Sherman can beat out Redmond. More hopefully, there are more signees to come.