1) Something I've been wondering: has a coordinator ever worked for a player they used to coach? Not that McDaniels coached Vrabel directly, and at this point it was 16 (?) years ago, but still.Which is why i like the option of McDaniels, he’s not likely to head coach again so there’s no where to go and he seems to like it here.
I’d also like AVP to stay if what they say about Maye is true. I don’t know if it’s TC McCartney or AVP or both, but if AVP is that close with Maye, they should get him on the staff somewhere if they can.
Beyond that, given that McDaniels has won many Super Bowls as an OC for the GOAT QB and run two organizations as a Head Coach, to me it would make more sense to go run a college program as Belichick did.
If McDaniels does return, I would hope to the points made he's comfortable making a multi-year commitment and not just biding his time until the right college/NFL position opens up. Particularly if the Pats hire a younger/less experienced OC or even retain AVP, I wonder whether he'd be willing to serve in a similar role to Vrabel's with Cleveland this year, as a consultant/advisor on the offense who works with Maye on specific things and offers ideas but doesn't have to be in the building at 6am every day breaking down tape.
2) To offer a deeply morbid and -- I fear -- almost flippant by comparison* example of a QB who had a great relationship with his QB Coach his rookie year but continued to develop without him, to this day Brady has talked about 2000 Pats QB Coach Dick Rehbein's influence on him as a rookie (Rehbein, who Belichick credited with being the person most responsible for the Patriots drafting Brady, tragically passed away in August 2001). Still, Brady was able to take those lessons and continue to improve despite losing his first NFL coaching mentor. (* Again, Rehbein's passing was tragic -- was glad to find this wonderful profile of Rehbein's family ESPN published 10 years ago: https://www.espn.com/nfl/playoffs/2014/story/_/id/12175963/dick-rehbein-championed-tom-brady-new-england-patriots)
Anyway, obviously this decision is up to Vrabel, but in his evaluation I don't think AVP's relationship with Maye is enough to overcome the disaster that was the rest of the offense and the lack of development from just about anyone other than Maye, Milton, and Boutte (no small feats, but not sufficient).
Given Maye and Milton's development, I agree with others that without knowing more I would try to at least retain McCartney.