See, after reading a lot of the responses, I'm actually more inclined to go with your answer. I think he said his goodbyes to the girls in his own way, and the dads came to send them off (I'm thinking Ben was brought along by Michael asking). And he, unlike any of the rest of them, needed to say goodbye to Daphne, Molly and Jen so that he'd also have enough time to have hot!farewell!sex with Brian before he left :)