Nominees... Holly Holm def. Ronda Rousey, UFC 193 Conor McGregor def. Jose Aldo, UFC 195 Stephen Thompson def. Jake Ellenberger, TUF 21 Finale Paul Felder def. Danny Castillo, UFC 182 Hisaki Kato def. Pat Schilling, Bellator 139 Thomas Almeida def. Brad Pickett, UFC 193 Robbie Lawler def. Rory MacDonald, UFC 193 Andre Arlovski def. Travis Browne, UFC 187
If not it's only because Holm worked up to that moment and it wasn't an RKO-outta-nowhere. Hard for me to not pick Thompson's spinning shit but Holm's knockout reverberated beyond MMA in ways we haven't seen in a long time.
As expected, espn has Holm rousey #1 and McGregor aldo #2 http://espn.go.com/mma/story/_/id/14422248/holly-holm-finishes-ronda-rousey