Preflop:
I'd expect MP to have AA, KK, QQ, AK, AQ. Maybe even JJ or TT. Due to relatively small size of the pot it's not likely MP attempted a steal here.
SB may well have noticed that his call gives BB and both limpers better than 3 - 1 pot odds. Let's assume BB folds. If first limper decides to call then the second limper gets almost irresistible 4 - 1 pot odds. So suited connectors are one of his possible holdings but I'd say not the likely one. Maybe he (and MP) knows that limpers will fold to any high enough bet and because he is acting out of position after the flop I'd put him on a similar range of hands as MP.
Main reason I put both of them on a premium hand is because it's early in a tournament and early in a tournament I want others to think I'm a tight player (if there is a showdown I want to show just premium hands).
Flop:
![The Two of Diamonds [2d]](https://pofex.com/images/smilies/2d.gif)
It is possible that SB's check-raise was a bluff. He might have spotted some weakness in MP's continuation sized bet. But if he is not bluffing then I can't really narrow his hand range.
I'd say MP couldn't have aces or queens here. He might have kings (and is afraid of aces),
![The Ace of Diamonds [Ad]](https://pofex.com/images/smilies/Ad.gif)
Given the preflop action I wouldn't be scared of a flush draw here (although it's possible - I'd play like it's not).
Turn:
![The Eight of Spades [8s]](https://pofex.com/images/smilies/8s.gif)
With this bet SB has committed more then half of his stack in the pot. If his check-raise on the flop was a bluff this might well have been a bluff too. He might (possible but not likely) have pocket eights. Again I really can't narrow his hand range here.
What about MP?
![The Eight of Spades [8s]](https://pofex.com/images/smilies/8s.gif)
![The Ace of Diamonds [Ad]](https://pofex.com/images/smilies/Ad.gif)
River:
![The Ace of Diamonds [Ad]](https://pofex.com/images/smilies/Ad.gif)
I think the bet by SB is strong. It appeared to me as he is acting weak just to made MP push all-in.
MP is geting 5.7 - 1 pot odds so it's almost a must call.
I'd say SB wins with AQ and MP mucks his KK, but I might get it completely wrong.