This thread reminds me of the Obama birth certificate conspiracy promoters: a whole lot of excitement and commotion about something with very little if any real consequence or import.
If you actually take the time to read the CME materials, and if you truly have the knowledge to understand what it really means... there is no dark or secretive advantage for designated MMs in any market with any sort of meaningful volume.
All high volume futures markets, like S&P 500 emini futures, Eurodollar futures, WTI oil futures, CBOT Treasury futures, HH Nat Gas futures, are FIFO (first in, first out).
The MM program applies for designated firms in some very illiquid markets, like Crack spread futures and some Eurodollar options. If you think there is an advantage to getting order matching priority for crack spreads, then be my guest.
Much ado about nothing.