Vereen is 5'10 and 210 lbs. That is NOT light in the britches for a RB.
Ridley was benched because of his fumbling which most expect to be worked on going forward. And he didn't fumble nearly as much as Faulk did when Faulk was a rookie. Could a vet RB be brought in? Sure. Is it likely? Not unless they are a significant upgrade over who is currently on the roster and I don't see one like that unless Steve Jackson gets let go.
The Pats signed 2 FBs in Larsen and Fiammetta so it looks like they will be using less 1 back backfields and more 2 back backfields.
There is no "overload" at either TE or at WR. The Pats have 3 TEs, which is the norm. It also gives the Pats 3 guys who they can legitimately rotate and keep fresh and hopefully injury free.
At WR, the only 3 that are guaranteed spots are Welker, Lloyd and Johnson. Branch, Stallworth, Gonzalez and Underwood are battling for 1 spot, in all likelihood. Edelman and Slater have the STs slots locked up. There won't be a WR drafted this year unless there is one BB figures is better than Branch, Stallworth, Gonzalez and Underwood. There may be a UDFA WR or two signed, but they'll end up on the PS more than likely.
And all this is off the subject of the schedule..