Hard to think that he could fly the planned manoeuvre from the planned entry height and not crash. Hard to think that if all aero displays were flown to a 5.000 ft base height they might all get away with it.
I can't deny that additional energy at entry could make the manoeuvre safer. But then what is the point of air displays? Hard to think we'd not be safer without them. And Formula 1. And ski jumping. And Rugby. It would be a dull old world, but safer.