5 left
smallish rebuy comp
payouts £930,475,300,210,100
136,000 chips in play
me 23,000
seat 2 20,000
seat 3 11,000 poor player, loose, limps in a lot even 5 handed, unconventional I suppose
seat 4 64,000 aggressive but never that out of line when in a pot
seat 5 18,000
blinds only 400-800, 20 mins left of level
I am BB

Seat 2 pass
Seat 3 raise to 3,300 leaving 8,000 or so
Seat 4 flat calls
Seat 5 pass in SB
I call 2,500 into pot of 7,800 getting 3-1 for odds/value
flop

I check intending to check-raise the short-stack allin or hoping he pushes, he is looking down at chips fairly obviously.
He bets 3,000 of his remaining 8,000
Big Stack quickly announces raise to 8,000
back to me, I am thinking that the short stack is obviously committed but there could be a nice sidepot to be won if Shorty has AK for example
question is who has the King?
If the big stack doesn't what is he raising with?
I consider big stack is a possibility for KQ,KJ,88 but I am ahead of other pocket pairs, flush draw, Kx etc
I believe i have no choice but to push here.
Would you concur?