I dunno OB, your last few posts seem to be more of what you would do if you were the Doc. He's just not like that. With few exceptions he rarely crosses his own timeline and he seems to adhere to Gallifreyan mean time, at least he did when it was still around. i.e. #4 did mention about going back to check in on Leela and Andred but it seemed unlikely he was going to go back a few hours after he left. He just doesn't do that. And after School Reunion I'm not sure why he would ever want to go back and visit. That was sort of heartbreaking. Or once he found out the Brig was dead, why not hang up the phone and make the call a year before? Because that's not how it works with him.