When do we call with combo draws? 100NL

[duckyfuzz]

5 handed, I'm in the CO/UTG+1. Short stack playing $31 limps UTG, I limp along with 9[img]/images/graemlins/spade.gif[/img] T[img]/images/graemlins/spade.gif[/img] (If he was 100bb then I raise) Folds to the BB who makes it $4 to play. This guy hasn't been playing long, 25 hands or so, he's seemed a bit loose and active, has raised a few pots, haven't seen anything nuts from him postflop though. BB has 100bb, I cover. Shorty calls and I call.

Flop is: 5[img]/images/graemlins/spade.gif[/img] K[img]/images/graemlins/spade.gif[/img] J[img]/images/graemlins/heart.gif[/img] Pot: $12.50

giving me a FD and a gutshot. BB leads for $10, Shorty folds, I call (not raise) because:

1) His BB raising range is probably a bit tight
2) This flop is good for his range
3) His flop bet is pretty large and is from OOP into 2 callers

Is my thinking right or wrong?