When you're 1-15, pretty much any position will help you at 12.
I'm going to work off of two assumptions.
1. The Browns resign Collins, which likely eliminates Foster and any other MLB from the mix since Gregg Williams is in nickel 85% of the time.
2. The Browns pick Garrett 1st, which likely eliminates Barnett and any other DE/edge from the mix since they'd already have Garrett, Ogbah, Nassib, Orchard and others.
With those assumptions in mind, the way I see it, any of the following players could be in consideration at 12..
QB: Trubisky, Kizer, Watson
RB: Fournette, Cook
WR: Williams
TE: Howard
OT: Ramczyk
DT: Allen, Thomas
CB: Humphrey, Lattimore, Wilson, Tabor
S: Hooker, Adams
That's 16 guys. At least five of them will be on the board at 12. Just stay where you are and pick someone who can really help you without sacrificing a top 60 pick to move up.