Per the contest language I posted.
The exact order will be determined programmatically by analyzing the time the resteem occurred per the transaction entry into the blockchain (which I have absolutely no control over) and can be verified by anyone who wants to look at this data which is public and immutable.
I am looking into the "un-follow" circumstance, but my current belief is the only way to ensure fairness is that an "un-follow" will not change the re-steemer that has won the slot but only if they are eligible to collect the prize. Any prize positions that cannot be claimed will either be given to another contestant randomly or possibly distributed to all who had no other winning slot.
With that said, the initial statement on the 51 restreemers still holds true, but we do not know yet whether they can collect the prize until they meet all the criteria.
Your thoughts are very welcome. And yes, this was certainly an experiment.