I agree they need to begin rebuilding the entire interior line.
LG – Mankins has 1-2 more solid years of football so we need an heir apparent in place.
OC – We need a long-term solution, even if Connolly plays there temporarily he is not the answer, I would draft Marcus Martin at #62.
RG – If Connolly moves to OC than that leaves this as immediate hole, I personally believe Marcus Cannon can be the answer here, others disagree, but either way they should look to draft a player like Joel Bitonio who reminds me of Mankins. He can backup and act as the heir apparent to Mankins long term.
In addition, I would look to bring in a player like Eben Britton who was a promising young player with versatility prior to getting Jaguared.
I do not think Belichick will target a defensive tackle early (unless by some prayer Donald slipped). I think he will attempt to squeeze one more solid season out of Wilfork and Kelly, and also hope that Armstead emerges as a long term answer at 3-Tech.