I'd imagine by 10am, most are gone especially since an entire hour (2-3pm) is gone from the selection window. I wonder if being there in line around 3pm nets you an easier time as far as waits. I guess it would depend on how they let people queue up when it's down.
I would think you could. With LLPP, you get one ride on each LL ride, and GOTG is considered (for the purposes of LL) to be a separate ride from GOTG: MAD. Please update us once you go!
Hopefully they can use "refresh" or "modify" and see if it will pop back up again. Even when rides show "sold out" for LL for the day, I have regularly been able to get a LL by refreshing or by trying to modify a LL that I have booked for a different ride. Just have to have very fast fingers when you see a LL time pop up!