$10 NLHE 6-max: AKo, 4 way 3bet/shove w/all in, 2 players still to act

BB and UTG are regs, I have seen BB make some pretty questionable calls, a few hands on UTG, but havent seen any thing that I remember about him, CO is a bit of a question mark, but seems pretty bad and fishy so far, so I donr mind being in with him. All the dead (?) money if I shove and get HU, but some how dont see anyone really folding. I am guessing I am up against MAYBE one worse Axs, maybe big BWs- BUT hmmmmm, or 3 PP.
Do we just gamble here?

full tilt poker $10.00 No Limit Hold'em - 5 players - View hand 2067471
DeucesCracked Poker Videos Hand History Converter

BB: $11.46 - VPIP: 14, PFR: 10, 3B: 4, AF: 1.4, Hands: 966
UTG: $12.15 - VPIP: 20, PFR: 14, 3B: 4, AF: 2.1, Hands: 425
CO: $5.45 - VPIP: 35, PFR: 26, 3B: 0, AF: Infinity, Hands: 57
Hero (BTN): $12.75 - VPIP: 20, PFR: 14, 3B: 5, AF: 2.4, Hands: 51381
SB: $4.20 - VPIP: 15, PFR: 12, 3B: 6, AF: 20.0, Hands: 253

Pre Flop: ($0.15) Hero is BTN with K :spade: A :diamond:
UTG raises to $0.30, CO calls $0.30, Hero raises to $1.20, 1 fold, BB calls $1.10, UTG calls $0.90, CO raises to $5.45, Hero???

I ship. CO has JJ like 99.9% of the time here so it's great if we end up HU vs. him. Even if someone calls behind, you're never in bad shape given all the dead money.

Shove. He's a half-stack who is back raising. You're flipping with him and there is lots of dead money to make up for it.

Ditto