At this (way too early) point ... pick two from "GROUP-B":
GROUP-A
Edelman (32) - likely lock
Cooks (24) - likely lock
Patterson (27) - possible lock (KR and ST add value)
GROUP-B
McCarron (24) - PR adds value
Mitchell (24) - chronic knee issues?
Dorsett (25) - vulnerable
Hogan (29) - vulnverable
Britt (29) - vulnerable
GROUP-C
C. Hollister (24) - likely Psquad?
If Patterson's ST chops (beyond KR) are really good, he might replace an ST/ELEO-reserve like Grissom, thus allowing the Pats to keep a 6th (real) WR. However, with the Pats likely to be keeping 3 QBs (including a draftee), and perhaps needing to keep a 9th OL (given the OT situation), it would still restrict the head count at another position (2 TE?, 3 RB?, 4 LB?).