Interesting, while Kelleher certainly isn't an exciting prospect or spring chicken(the guy is 35) he does present a MUCH more well rounded game than Sean's previous opponents, he's got power, and he can mix it up with a good submission game. If we see that area of Sean get tested in this fight, it'll do some good to answer the critics in that regard as he's mostly fought Strikers.
Maybe Moutinho showed somewhat of a blueprint? I noticed in that fight O'malley only backed up in a straight line but it didn't matter because Moutinho had 0 defense. If Kelleher is better at cutting off the cage and punish O'malley with while doing so, it could get interesting.Don't see how Sean loses this really. Brian is a solid gatekeeper but I don't really see what he's got that's going to stop him getting pieced up by O'Malley.
Kelleher is a scrappy dude. If he can get close enough he could grab something.