All powerful in their field run by egomainiacs who over reached themselves by thinking they were invincible? Naaah, no similarity there at ll.....
Very very different in that Tony Ryan and Michael O'Leary are chalk and cheese. One was a definite Patrician with Country squire aspirations and the other as far removed from it as you can get.
GPA tried to float in middle of downturn and ignored the advice it was given.
David Bonderman acquired major part of it and of course he has gone on to other things.