Let me see ...
QB: Prescott, Rush, Grier/DiNucci (3)
RB: Elliott, Pollard, Nall/Dowdle/Shampklin/Davis/Ralston (3)
WR: Lamb, Gallup (probably PUP'ed), Washington, Tolbert, Brown, Fehoko/Vasher/Smith/Drummond/Fryfogle/Houston (5 or 6)
TE: Schultz, Ferguson, McKeon (3)
OL: Tyron, Tyler, Biadasz, Martin, Steele, Waletzko, Farniok, Lindstrom, McGovern, Ball (10)
That's 25 or 24 on offense, if Gallup is PUP'ed and we don't carry a sixth receiver.
DE: Lawrence, Armstrong, Williams, Fowler, Golston, Basham (6)
DT: Gallimore, Watkins, Odighizuwa, Ridgeway, Bohanna, Hill (6)
LB: Parsons, Cox, Vander Esch, Gifford, Harper, Clark (PUP) (5)
CB: Diggs, Joseph, Brown, Lewis, Wright, Bland, Goodwin (7)
S: Kearse, Hooker, Wilson, Mukuamu, Bell (5)
That's 29, but I can see Hill being cut, so that would be 28.
K: Garibay/Naggar
P: Anger
LS: McQuaide
That's a total of 57 or 55 (with five receivers and Hill cut). Who else you cutting? Numbers say 12 DBs is too many. The other cut area would likely have to be either DL or OL.