Unlikely to see the prize pool being that big from any witness outside the top 20 i'm afraid!

You are right in that it must have been some med-large accounts adding votes, 500 minnows would have not really made a dent in 4000+ MVESTS.

Which means, if my spitballing is correct, there's either more community minded higher SP out there than what we generally give credit for, or some other reasons exist.

A fair reasoning, at least one to hope for at least :)