Not necessarily. He’d still have a forum during sentencing, and he could stand up and walk the court through his crime.
BTK and Gary Ridgeway (Green River Killer) did this. I’m not saying that JP is a serial killer, but his psychology may be similar.
He’d still get his moment in the spotlight.
He'd get his moment in the spotlight that way, but only a moment, versus days at least of his crimes being dissected by multiple witnesses on the stand, and being the "star" of a trial.
Based even on just what we know, I also believe he's a sadist as well as a psychopath, and that he is intent upon inflicting as much pain as he can while he still can.