Great points!

It shows (I think) that the current witness-voting process is probably fairly robust in response to vote-decay propositions.

Yes it does, I should probably state that in the post now you've pointed it out :)

I'm guessing that the big changes in the second analysis "last vote or comment" are from freedom not being a voter/commenter? The three guys that jump up the rankings are the top three witnesses without the freedom vote.

Very likely that is the reason.

Thanks for the additional analysis on the results, appreciated :D