Regarding #11 - I've seen reports he was on Valium, also known as Diazepame, which is also used as a sleeping pill. Taking such pills usually makes you feel drowsy and sleepy the next day - not the best shape to commit mass murder.
It is also incredible that the police took more than 1 hour to enter the hotel room. We have to assume that there was some security at the concert and the alarm must have sounded pretty quick...something doesn't add up!
One other thing I don't understand. How is it possible that the first reports only spoke of 2 dead and some 20 wounded when the final toll indicates a bloodbath. I'd say it would have been pretty easy to asses the scale of the tragedy ...