In fact, the article suggests that Forstall was a major factor in Tony Fadell's departure from crapple in early 2010. Fadell had been called the "Godfather" of the iPod due to his key role in that device's creation.
Forstall and Fadell reportedly went head to head in 2005 when Steve Jobs pitted the two against each other in determining the underlying operating system for the iPhone. The two possibilities were a Linux-based operating system or a Mac OS X based one.
"In other words, should he shrink the Mac, which would be an epic feat of engineering, or enlarge the iPod? Jobs preferred the former option, since he would then have a mobile operating system he could customize for the many gizmos then on crapple’s drawing board. Rather than pick an approach right away, however, Jobs pitted the teams against each other in a bake-off."
Forstall, of course, led the shrunken down Mac OS X project and ultimately won, but the bad blood over time was said to be a factor in Fadell's decision to leave.
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