unless/until the QB situation is settled, signing a WR, especially a high priced veteran would seem stupid.
If the Pats bring in a veteran QB, then they are looking to win now, if they go with Stidham, they are tanking/rebuilding and signing a high priced WR would not make sense. The Pats basically wasted last year, going into the year they didn't know who their QB would be, and if Stidham is any good. Now a year later, they still have no idea who their QB is going to be and if Stidham is any good. Except now, all the veterans who have carried this team are now a year older.
The Pats don't have a single player under 25 that you would be excited about his future. The roster has been depleted by years of bad drafts.
The only position I would say they are OK with for younger talent is RB. The O line should be OK, Shaq Mason and Tuney were both excellent picks, but Tuney is gone. So they are, at the moment, without Andrews and Tuney. I think that Cannon's career is over. Heron might be OK. They either need to find a new LG or a new LT and kick Wynn down to Guard (that is if he doesn't end up on IR with a hangnail).
So no QB, the O line in flux, why would any good veteran WR sign here?