He left us a few clues ...
1. He was a pilot and owned a small plane spells he is not that dumb
2. He owned several homes and just sold them moving into the one he has now
3. He was a heavy gambler into video poker
4. He had more guns and ammunition at home
5. His own brother, who lives in California, moved him into his present home a year ago
6. His own brother didn't know he was into guns
7. He checked into that hotel on Thursday
8. The country music festival was Friday night, Saturday night, Sunday night ...
9. That many guns and stock pile of ammunition had to be premeditated
10 He didn't know how to shoot an automatic weapon or he would've shot in small burst ...
Whoever sold him those guns semi or automatic is probably on the run before the ATF catches up with him