How about publishing rules for a contest and sticking to them, or canceling the contest entirely if it's not going the way you expected or desired? If there was a risk that some founder you didn't like would be picked the rules should have been clear about how to prevent that (through interview, etc.). And if you realize the rules didn't cover this contingency then scrap it entirely and start over with new rules.
Frankly I'm surprised that this is being pushed back as some failing of the HN community. This is clearly a failing of the contest creators.