It's basically a conspiracy theorists wet dream at the moment.
They're deep diving his background, but the general word that seems to be leaking out is there are no signs in his background, no odd websites viewed, no strange behaviour, no extremist leanings, no training, no ptsd issues. And then he got x many guns up to a hotel room, disabled security devices in the area, got the window out all without attracting attention from Vegas Hotel security, before actually commiting the act.
There are already pictures going out with "Look, broken windows floors above him, that's where the real snipers were. It's a false flag, its this that or the other."
Oh the sheer joy of the many, many opinions that will crop up.