Available FAs aren't all that enticing. Via trade we would have better chances to improve the WR core and good receivers are either on expensive deals or on rookie contracts.
Sure, we would have no problem signing a receiver for 5 million per year but who? Don't see anyone out there on the FA market that improves our roster.
There are all sorts of roster transactions over the summer, and there will be receivers currently unavailable either released or traded between now and September. I’m sure the Patriots are tracking rosters and possible moves that may be made and that they can add more competition to this WR unit between now and the real start of football. We’ll see.