Did he check his batteries before his third flight under a 1.5 amp load? How new were his batteries? The CDI definitely draws down the batteries faster, so you need to check them after every flight. I've also had servos go into self oscillation and draw over 1.5 amps, and almost crash a plane. The situation you describe sounds like a dead short, or a main switch failure. Or something came unplugged.

What did the battery read after the crash under a 1.5 amp load? I don't fly below 7.3 volts.

I don't use the Jaccio regulator, but I use the Alt regulator in two different planes with CDI with no problems.