Re: greatest aura of invincibility
Liston pre Clay
Tyson pre Douglas
Out of those listed I would stick with the big boys and say Foreman post Frazier. Once the 0 goes the aura of invincibility is never the same.
Hearns and Hagler support was pretty evenly split leading into their fight so I doubt you could say Hearns had an aura of invincibility around him.
Hagler pre Duran was a bit like the Klits at present. An elite in an era that back then was percieved to be pretty average at the weight. I think that the fact that his greatest anticipated opponents came from lower weight classes suggest he was not considered to be unbeatable. There were only muted murmurings of him fighting the Qawi, Saad and EMMs rather than the hype of the Fab 4