He's not flawless - but if the story is correct, he was certainly undermined and then hung out to dry by the CFO.
Basically the jist of the story is, once Iger soured on him for not continuing to kiss the ring properly, he was more then willing to undercut him and lead to his demise.
You can't give someone the keys to the kingdom and then work against them from inside. And that's exactly what Iger and the board apparently did.
No one is going to bat .1000 with their choices, nor be the perfect avatar from the get go.. but Disney sure has a history of screwing up promotions.