is it possible that some of the "evolution"-coins are being processed/sold using drk?
Well "some" would quite a small number. I thought like 70,000 BTC where stolen and DRK/DASH volume in the last week is a couple thousand BTC(on Cryptsy). Maybe the total volume is 3x or so (6000-7000 BTC). So I don't think the coins are going through DRK/DASH.
Plus, looking at BTC's sudden drop I would say that most of the evo coins have been dumped.