I think the point that Leemon is getting at is that Hashgraph is a completely different algorithm / data structure than blockchain at the very foundation of the distributed ledger applications that are being built. EOS is a distributed ledger application and is therefore far more than just a blockchain. What Leemon suggests is that if these applications like EOS are modular enough, then you could swap out the blockchain algorithm at the foundation for a Hashgraph algorithm. This is already happening with Lykke. They are implementing Hashgraph at the core of their architecture as far as I'm aware. Regarding EOS, [I have some separate concerns about EOS, that you can read here.](https://steemit.com/steemit/@alexpmorris/the-blockchain-just-became-obsolete-the-future-is-hashgraph-or-not#@newsandviews/re-alexpmorris-re-newsandviews-re-alexpmorris-re-newsandviews-re-alexpmorris-re-newsandviews-re-alexpmorris-the-blockchain-just-became-obsolete-the-future-is-hashgraph-or-not-20171228t181541778z)