It's an interesting phenomena that seems to happen all the time.
Generic idea exists for a while, then someone proposes a more specific implementation and gets known for that, then people start rethinking those details and arrive at the generic idea again, but still think of it as coming from that person.
Another example is how plain-old Merkle trees are now being called "blockchain": Satoshi combined them with other ideas (like POW) to arrive at Bitcoin, then other people started separating those off and got back at just Merkle trees, but still think of them as originating from Bitcoin.
Generic idea exists for a while, then someone proposes a more specific implementation and gets known for that, then people start rethinking those details and arrive at the generic idea again, but still think of it as coming from that person.
Another example is how plain-old Merkle trees are now being called "blockchain": Satoshi combined them with other ideas (like POW) to arrive at Bitcoin, then other people started separating those off and got back at just Merkle trees, but still think of them as originating from Bitcoin.