as I had said before. were not comparing endurance right now. were comparing his ability to sing difficult arrangements. I'm not suggesting that he can sing for two hours better now than he could sing for two hours in the past.
As I had mentioned before in response to the dangerous and history tours, the man had a lung disorder. Your going to get winded a lot faster. But before he actually gets winded, he would sound a lot better than he EVER did back in the day. during the dangerous era, he had a much wider range than in the 80's. His range expanded so he could hit deeper and lower notes, but he did not lose the high notes he had during the 80's.
Look at human nature dangerous tour. most of the song sounds horrible, but get to the part with "why, why, why, oohh tell her" for those few seconds he sounded better than any earlier renditions of the song.
basically his lung disorder took away his endurance. if you give him a minute to catch his breathe though he was ALWAYS better than at any point before that.
I guess that kind of explains my feeling on the history tour as well. his ad lybs for billie jean sounded better live, than the way his voice sounds on the actual album after being touched up in the studio. his adlybs on beat it were always incredible as well.
as for push me away, that's not real impressive. I'm not saying nothing from that era is impressive obviously. but where is the growl that switches to a soft falsetto in what sounds like an impossible note combination? or the going from low pitch to high pitch?