I think these 2 acquaintances started chatting on snap chat, agreed to meet, friend picked BB up and they headed to the parking lot of Hobby Lobby. (Has there been and surveillance video that backs this up?) Decided they needed some more privacy. Blaze suggested the park, I'm guessing the friend didn't know this park. It isn't on a major street, no signage, etc. Went to the darkest part of the park, something went wrong. Friend changes his mind, got disgusted with himself, angry with BB and strangled him. Drug his body to the closest bushes and found the drain pipe but it was bolted closed. He left, went and got a wrench, things to clean up a bit and something to mask the scent maybe? And went back to the park at 3:40 like he said he did to hide BB's body better.
The only other logical conclusion is that the friend knew the park and knew it well enough to know the drain pipe was there and this was premeditated. But I doubt someone from Newport Beach knew of this park.
In either case, I think the attack happened in the park, in that back corner. I can't imagine someone carrying/dragging someone the length of this park.
My deepest prayer is that these parents get clear answers as to what happened to their son. And that there is complete justice for BB.