It is unreasonable to take a tackle earlier just because tackles are more important that guards.
OUR SITUATION AT OT
Belichick may believe that we are fine at OT for the next two years. Kaczur is an RFA in an uncapped year. We have two capable starters and a decent swing backup in LeVioir. We even have two players who have started for us competing for the #4 position in Britt and O'Callaghan.
Belichick may see little need other than to bring in some youngsters to compete for one of the backup positions. There are many solid prospects from Round 3 onward.
My personal preference is to draft Britton if he is available at 23.
OUR SITUATION AT OG AND CENTER
Koppen will continue at center. Mankins is an RFA next year in an uncapped year, so he will likely stay. Neal will be a UFA with injury problems. Hochstein and Yates are signed each year as backups.
We have ZERO long term guards, no backups, no starters. This situation is much different than the situation at guard. That being said, offensive lineman can start for us as rookies (Mankins, Woody, Koppen, Light, Kaczur). IMHO, we need a bring in one top guard if we can. It would be plus if this guard is also a center, so that he can be the gameday backup for all the interior positions and be the backup center. All that is now Hochstein's role.
Even if the 3 best OGs in the draft are all centers? All of Mack/Wood/Unger can probably play OG or convert there, but it hasn't been the primary position for any of them? And I can never understand the logic of prioritizing a guard over a tackle when both are needs. Tackles the more important position, and the harder one to fill.