Carwin vs. Gonzaga was a one punch finish.
I think we need to clarify what "flash KO" really means... I understand (within the context of the videogame, both 2009 and the demo) "flash KOs" to mean fights that end suddenly in KO without a significant amount of damage... so say in 2009, when it had damage statistics in online fights, you'd suddenly get KOed by a punch really early and see you had only taken say, 25% head damage. It was an unusual KO within the mechanics of the game as you hadn't really been hurt to the point of getting knocked out, hence the term 'flash'.
I'm not seeing that in the demo. It takes a lot of damage to finish someone even if you do that damage quickly.
I get alot of hard KO finishes, but nothing with 'unjustified' lack of damage like last years "flash KOs". Whenever I KTFO someone in the demo, its after I've done some serious damage even if its quickly in the first round. I haven't seen any KO's out of left field.. I've seen odd knockdowns, and being rocked, but never KOs.