I personally don't see a sense in integrating a DPOS system into the sidechain because truth be told between you and I.. I think the DPOS system has some glaring weaknesses that tend to push it towards functioning in ways politically that I find to be detrimental to the whole decentralization concept.

Not to take a shot at our witnesses.. They are great dudes and ladies.. But it's not terribly far back in the past where you can see some of the glaring faults of DPOS based systems costed people millions of dollars out of their own pockets in addition to all the years spent promoting the chain we fled from.

Eventually anyone with a computer will be able to become a HSC mining node and thus be able to help protect the sidechain through decentralization all the while earning a little HIVE on the side for their efforts. My guess is that out of the box when HSC launches though it'll be only those techy types that run a Hive.Loans fork and their own lending platform which will under the hood be running a HSC instance that will communicate with the genesis node which starts the EVM under the hood of Hive.Loans.