But the stock dropped 1% in the seconds after the announcement. This isn’t a 1% drop over the entire day; it’s a 1% drop in 30 seconds after the market has closed. I think it’s safe to say the market values Ive’s contribution to Apple at $9b

That's not "safe to say" at all – markets don't respond well to uncertainty, and SVP-level changes at a company like Apple = uncertainty.

If the company's market value was consistently $9b lower after someone left, then you might make that case.

Assuming the market valuation of this I worth a cent. Which... it probably isn’t.

After hours activity doesn't mean shit.

But in the real world he is definitely not the wealthiest person in the world.