I haven't said anything about anyone being at a disadvantage!
When I say 'prefer' I mean "if given a choice between evaluating apps with 2015 MCAT or old MCAT, they would prefer to look at the score they know/understand", not "will let in someone with a crummy old MCAT over someone with a good 2015 MCAT".
I understood what you were saying about preferring the actual TEST (I also never used the word disadvantaged when responding to
your take), and already pointed out to you why I disagree with that: I think AMCAS
is very much a disconnected body handing down decisions regarding the test, and most adcoms are just shrugging and going "OK, here is what we are doing now." I don't think that AMCAS' decision necessarily tells us jack all about the preferences of individual adcoms. I have outlined above my own reason for thinking that the individuals would prefer to use the old TEST over the new TEST when making evaluations (which, as you point out, does not equal discrimination between applicants with one or the other score). That doesn't mean this won't change in the future as they become familiar with the new one (as I described in my last post).
I
am disagreeing with you, not because I don't understand your point, but because I simply don't concur.
At any rate, I've said my piece, you've said your piece, neither of us believe it makes a difference to the individual applicant, and I don't believe anyone is hugely invested in this beyond that point of agreement

Shake hands?!