RE: How should Steemit Inc decentralize their stake?
I would oppose airdropping to the "best" Steemians, since that would likely ultimately boil down to a centralized body determining who qualifies as "best". Since the "best" Steemians would probably end up being those that already earn significant rewards (and therefore probably already have connections to one or more whales), this could actually have a centralizing effect, rather than a decentralizing one.
Just my opinion! :)