Yeh, he probably intended it to go off inside the stadium. Either with it still on his person, or not. What about his "interesting" roomate. No way he didn't know about the explosives and weapons.
"Some of us will forever wonder what he (Hinrichs) was doing at that time, at that place," Police Chief Phil Cotten said.
If it wasn't a suicide, then he likely meant to set it off somewhere else. He certainly wasn't walking out to Red Rock Canyon at that time. (Night).
Red Rock Canyon State Park, OK. It's the little green slice near Hinton, OK. A good long walk, about 72 miles from Norman.
He was not able to get into the stadium. I think he was waiting for the game to end and crowds of leaving fans to come out. That would probably do more dammage than hanging around inside anyway.