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> gained enough knowledge of the systems to be able to reverse engineer an exploit from scratch, after leaving Apple

While the other two are suspicious, I don't think the last one is. If you're good enough to come up with a clean room implementation than I don't see any foul play here.

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Isn't that by definition _not_ a clean room? You have knowledge about the device that you wouldn't be able to derive just from looking at the device itself.

What was his position at Apple?

No, that's what the other two were. I'm saying that there's the possibility that you got hired at Apple because you were smart, and end up continuing work on iOS even when you leave, but without any sort of knowledge of the internals. For example, say they rewrote some portion of code that you were familiar with: in that case, you should be free to take a look since you no longer have any inside information on it.

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