With 2 reggish looking players, i think 4betting vs the squeeze is going to be more profitable as, like you said you take down the pot and do well if he decides to flat the 4bet.

As played, i think your line is OK, you get here with JJ and AJs, maybe AJo as well so AK is fairly high in your range. Having the Kc isnt great but at least you have outs and he could be doing this with AQ or whatever. His sizing means that there isnt really much room for calling so prefer shoving if we are continuing.

SB isn't going to have a lot of offsuit hands sqzing vs MP. KcQx is the only simi-bluff hand you really block in his betting range, but you block KcQc and KcTc as well. Having Kc is very good thing for you as you are freerolling other AK and drawing vs 2pair+. Overall, against some AK, 2pair, sets, flush/ GS+FD range, Kc gives you like 15% extra equity.

Typically a 4b spot against the squeeze.

Calling is not too bad but against two players, I don't like it.

I can't see an escape post flop.

Thanks for all your comments.

Further question... if i 4 bet and he shoves am i just calling it off?

Your postflop play is perfectly fine. Just think about what else you can do on each street and you'll quickly find you can neither fold the flop or the turn (with the Kc). Even without the Kc finding a fold would be hard since he could still do this with AQ with Qc and other AK.

Preflop a 4bet is fine too. If the stacks of SB and BB were reverted so the BB ended up being 200BB deep with you I would strongly prefer your call. But because it's the SB player who is deep (and he flatted in the SB and mostly capped his range) a 4bet is really fine here. Flatting sometimes is still not a mistake.