Never met the man, so difficult to voice an informed opinion. I can only form an opinion based on his public record.

Turned around CO and ran large airlines for nearly two decades. By that metric alone, he must be a very smart person. I wouldn't last 5 minutes as a CEO of a public company, so obviously a lot more suited to running an airline than I could ever be. Was never actually charged with anything so that would suggest there was not sufficient evidence of wrong doing. Also never walked a mile in his shoes.