Conor McGregor claims he landed the last -- and most brutal shot -- during the UFC 229 brawl back in October ... hitting Khabib's blood relative square in the jaw.
And he claims 2 photos tell the real story.
After the first ring attacker (in a red shirt) climbed into the octagon and cracked Conor in the face multiple times from behind -- another man attacked McGregor from the front.
"He attempted to use the big security guard that’s in all the movies as cover," Conor said ... "but I could smell him a mile away and landed flush down the pipe.