I think I worded that extremely poorly. His claim was that basically none of the mass achieved escape velocity, which implies that the upper limit to the debris' velocity was 11.2 km/s. However, I said that 11.2 km/s was the fastest a particle would need to go to clear the potential well, which is wrong. That's the slowest it would need to go. It'd be much appreciated if you could amend the quote with a small note or something.Furthermore, assuming that Alderaan was Earth-like, the fastest any particle would need to go to clear the planet's potential well is 11.2 km/s. If a significant portion of the planet's mass was moving that slowly, we'd have observed a large concentration of mass remaining after the explosion. Since the entire space taken up by the planet was cleared, we can safely conclude that you're wrong.
This is basically clarified in my response post to him, when I chastise him for assuming that a grenade exploding is analogous to a planet exploding.
EDIT: Oh yeah, and you didn't mention his claim of driving all over the country and spending $800 on gas to personally sit down with a bunch of college professors just to hear them say you were wrong. That was one of the funniest things I'd ever heard; you have to include it.