I don't belive scully brought any of his people in Apple. Jobs was kicked out of exec position by his friends (markula, was not suported by wiz, ext) cause he had no concept of spending to much money on products.
One of Jobs great side of being CEO was when he saw great product or component, he would make up his mind in 10 minutes. Other bigger companies would have surveys and some suit-and-tie-non-tech people to "look at this product" and would take them 3 months do decide (according to Steve Jobs book).
Also in Steve Jobs book, there is quote from Steve who said "Tim Cook is great, but he is no product person. He is not person for inovation" (this is not exact quote). Now, knowing that, i don't know why he would have timmy for CEO, but maybe others were worse? Mansifeld was/is all about money, Eddy Cue and Phil Schiller are marketing persons, Ive is hardware designer (his big task is iOS 7 and is not gods work as people here taught it would be since for them Ive is nothing short than second comming of christ). Maybe Forstall was in the game but was on Jobs 1.0 level, to young and wild. Maybe there will be Forstall 2.0 who can do something good for Apple again.