Dave is loose aggressive so suited connectors are definitely a playable hand for him. And evidently he's got the best hand.
If the other guy's got aces, he's playing it poorly. Hek even A7s wouldn't behave this way. You might min-raise to induce an allin by the guy with the 7 but not big-raise to chase everyone off.

He's either got the top pair or he's overbetting the crap out of his KQ of clubs flush draw.