satoshi is one entity. although he created bitcoin. the first currency that utilises lots of technologies into one unique project/currency.. you are right bitcoin and blockchain it is made up from a patchwork quilt of different idea's from different people. and satoshi just had the unique vision to sew all those concepts together into a seamless quilt. which no one else dewn together in such a way before.
having some data in batches where an identifier of a previous batch of data is added into the next batch of data is what these guys contributed to being what we now call blockchain
https://www.anf.es/pdf/Haber_Stornetta.pdf5.1
Linking
Our first solution begins by observing that the sequence of clients requesting time-stamps and the hashes they submit cannot
be known in advance.
So if we include bits from the previous sequence of client requests in the signed certificate, then we know that the time-stamp occurred after these requests.
But the requirement of including bits from previous documents, in the certificate also can be used to solve the problem
of constraining the time in the other direction, because the time-stamping company cannot issue later certificates unless it has
the current request in hand.
and thats what the "chain" part of block chain is originating from
it was then satoshi who then decided on things like hashes/mining (PoW) instead of signature certificates(PoS) as the block identifer that not only locks the current block but then the identifier is added to the next.
so whether it was PoW of PoS haber and stornetta inspired 'blockchain' by their mentions of a sequence of bits linking documents of data like chain links