Genghis opines in #18:
"... that'll lighten the aeroplane and move the CG aft..."
Interesting observations about radar, thanks.
I'm not so sure about CG shift. He was sitting almost exactly above the centre of lift of the wing which should be roughly the CG. If he left carefully, assuming he could get the door open, i wonder if the a/c would have proceeded until it ran out of fuel (as is suggested for MH370 which, of course, had the benefit of an autopilot), thereby creating, as his legacy, a bizarre mystery 100 miles away somewhere or other.