The more I listen to the testimony the more I lean toward Alex got sideways with the drug cartel and they set him up real good.
My other theory is that Paul and or Maggie hid his oxy pills that evening and he went psycho because he needed his fix and got into a row with them down at the kennels and then in a rage shot them. But to me if it was an argument turned deadly he’d be more likely to just grab a gun and shoot them not two guns and three types of ammo. That takes some thought.
...Or he’s the coldest son of a bitch on planet earth and he sacrificed them to get out of trouble with his business partners for various reasons.
It seems he was there when they were shot. He has some splatter but not much.
He was there mere moments before or during the time they were shot. One thing is certain, it’s entirely possible Alex said not one word of truth during his testimony.