That does not make any sense to me either. Why current bitcoin holders will get any advantage in PoS distribution ? Moreover, a lot of non-tech people keep coins in exchange/wallet for which they dont hold the pvt key. PoS, in any form, is nothing but a pure BS.
As you see the "initial distribution problem" is not something trivially solved (it is the Achilles heel of PoS IMO).
You can take a look at Bitshare's distribution for a relatively fair distribution model.