I'm not sure I'm with you on that, but that's not really my point.
My point is that there is a very big difference between aiki and aikido. Just because you see aiki in something doesn't mean there is aikido there. To say that MMA fighters (most of whom have never trained aikido) are doing aikido makes about as much sense as to say that every musician who improvises is playing jazz. Sure, improvisation is a foundational, unifiying concept of jazz, but that doesn't mean jazz has a monopoly.
I am with you on this.
From my perspective, aiki is a universal principle. Forces meet and merge every day. Therefore, if you watch enough MMA fights, eventually you will see aiki happen. It doesn't mean that either of the fighters studied it or meant to apply it.