Shooter’s haircut looks military to me.
He’s pretty skinny.
Your theory sounds about right.

The guy reminds me of the fake patriot front who have faded away, just threw it out there to see if anything sticks.
It seems obvious to me that there is a lot going on in the background we're not privy to. Another claim that we finally have the shooter, we'll see how that plays out after the previous announcements.
Too early to say.