This is the first time I've seen such a detailed timeline. The dinner started around sundown. We struck at about 3 a.m. local time. So the only way we get Zawahiri is if he spends the night there. Now that's certainly a possibility, given the other big names we likely killed. But it doesn't fit the profile of someone who's been on the run for several years.
This link has a different scenario, at least at the end of the event. See paragraph 8:
http://72.14.203.104/search?q=cache:iwW-o9bwx5kJ:www.saag.org/%255Cpapers17%255Cpaper1677.html+Mamond++Pakistan&hl=en
It also suggests that the surveillance was more than just our airborne Predator assets.
Thanks for the ping.