Personally, I think the DA is deliberately over-charging DA in order to apply pressure to get him to talk. I think he'll make a deal. Charges dropped, or reduced to something very minor, if he fingers EN. The DA really needs that, IMO — because there's still the chance that the judge won't admit EN's confession to Mogg, and without that, I think they're going to have a hard time proving EN was the shooter.
Eyewitness testimony from the driver who was in the car with him and saw him pull the trigger would be very good proof that EN was the shooter, even without EN's confession.
That's what I think. Purely my own opinion. JMO, IMO, MOO and all that jazz.