Dave is a natural born leader. He's the one who runs into the crowd with arms waving around claiming to know where the cheese is while most have no clue there's cheese to be had.
He's the one you want on your side when you're about to face the music. And when you do face the music, he's the guy who knows where the volume knob is. Does that make sense?
Anyway, Dave gives you the thumbs up. He knows that you know he knows you know.