I don't thin anyone had invented an MP4 player by the time the iPod came out

. I don't think patents,
particularly in the US, are a valid measure of 'inventiveness'. Especially when you're talking about someone who worked within a giant corporation, it's very hard to say who specifically 'invented' a thing that company sells.
As above, I think 'reinvented' isn't quite the right term. 'Popularised' is a better term. However, I'd argue we need people to popularise technology just as much as we need people to invent it. If you want milk you need a cow, but you also probably need a farmer to get it out of the cow and put it in a bottle for you.
Jon