Agholor is not a "physical vet." Is Bourne? I don't think so.
I agree the team is improved overall, however, if Belichick isn't trying to get better than Buffalo right now then he should be fired. It generally starts with winning your division. What Tampa Bay did last season is rare. By December Buffalo was toying with New England at Gillette, it was embarrassing. Buffalo is going to be very good again next season. Sanders improves their wide receiver group and their passing game was already among the best in the NFL. Josh Allen is going to be an MVP candidate, our quarterback is a stiff, so it's hard to imagine how the Patriots are going to make up 6 games from an offseason where they've left themselves way behind still at the most important position.
You said "the Patriots are going back to the 2012 Gronk/Hernandez offense with Henry/Smith." At the very least it evokes comparison. Gronk and Hernandez were part of a very dynamic offense led by an all-time great quarterback in his prime. That's not at all what the Patriots are building toward. Honestly they're putting all these potentially good pieces around a washed up quarterback who was never that good of a passer anyway aside from one season when his TD% was unusually high, especially relative to his career percentage. I doubt Henry, Smith and Newton are going to remind anyone of Gronk, Hernandez and Brady.
Yards per attempt? Isn't a QB stat? I'm pretty sure the receiver stat is yards per target where Agholor ranked 6th. He was 2nd in yards per reception. He won't be top 10 in either category in 2021, which is all that matters right now.
You got his age right at least. He actually played in 17 games in 2019 due to the trade from Denver to San Francisco. He only missed 2 games in New Orleans this past season. So in the last two seasons he missed a net of 1 game. Adding in 2018 and 2017, over the last four seasons he's missed 10 games, which is a lot less than 21. From 2012 through 2016 he missed 1 game in 5 seasons. He is going to finish the 2021 season with better numbers than Agholor.