On a knockdown as a Ref may rule when a knee touches down that it’s a knockdown and issue a standing eight count.
If you are knocked down the Ref counts to ten he will declare the bout over.
Conor didn’t touch a knee down. He was twisted along the ropes and couldn’t defend himself or keep his hands up.
So the Ref seeing him helpless called the match and that’s a TKO.
Boxers can’t match up in the Octagon. Lots of martial artists in that sphere and they can’t compete along those lines since most matches are not won on boxing skills alone.
Boxers can’t match up with MMA in the ring either. Conor was very impressive up until he ran out of gas. I love Floyd but he would not last one round in an Octagon. I’ll bet you my favorite guitar on the rematch.