Guilty. If the facts are as alleged, he's guilty.
I'd keep an open mind if I were on the jury. But I'm not. So, here's my opinion. He will be convicted.
There's direct evidence he was there: multiple videos and the text from the deceased. The circumstantial evidence, if true, is overwhelming. There's no conceivable chance based on this recitation of the facts he was coerced or an unwilling participant, or confused about what was to occur. There probably will be direct testimony on the murders themselves.
I said on here a couple days ago that the least culpable would start talking, and that's probably the case.
It might take a year for this to play out, but my supposition from a couple days ago is the most likely direction this will go:
He'll plead diminished capacity or lack of culpability because of (1) repeated concussions, (2) steroid use, and (3) painkillers. He'll say he had no choice because his job required him to play through pain and use medications. (This will be on advice of his fancy-pants lawyers, because there will be no chance of beating the charges directly.)
As a bonus, he might plead diminished capacity because of fetal alcohol syndrome.
These arguments won't work. But it's all he's got. The lawyers will wind up with his signing bonus. And he will do the time.
Sad, sad, sad.