Welcome to my position research effecting ability proc hub. (PREAPH?) One of the biggest unverified things in the game for most seems to be how or even if the position your cards are in affects the probability of abilities going off. I don't think I'll be able to show anything one way or the other, at least not by myself and not definitively. Still, I think it's worth getting started. Bald Bigfoot and I talked a little about it. So information regarding exactly how I tested which usage can be found within each run of those usages.
For similar research: See Harryc's blog
Very High Decks
Relatively High Decks
1 Deck - Relatively High (Rare Beast or Scientist Fantastic)