Rogan and DC also though Max's spinning back kick were a relatively new thing at UFC 300, when he always had it and used to spam it in his early fights.
Lol that's true. The Holloway stuff was kinda silly. The JJ though, I think he tripped in saying "had never used it before". But when he said developed a spinning back kick, I take that as valid... let's say, mastered it. Not fully, but doesn't matter. He trained for months with that Muay Thai French famous coach and with that legendary kicking artist as well (Thai White, I don't remember the name). Before, it'd be used more often to just be a big kick to the belly, but not with KO intent, more like a way to be weakening the fighter. This time, he used it twice, both right at the ~ 1 minute left of round two and then at the same time mark in round three. In the second, he threw more unpretentious, he tried to gauge Stipe's reaction to that. But his spinning back kick and his spinning kick (based on many analysis videos, from Like Thomas and from MMA obsessive analysts and studiers from Korea as well, heh I speak Korean too)
JJ said he had said he would finish Stipe before the championship rounds so he was expecting a mid to late round 3 finish while dominating the fight. And he said he wanted to do Stipe Stipe — to drop him with a big body shot and then finish with ground and pound, like Stipe did to DC. Jones said tho that he was planning on using more left hooks to the liver, but once he felt Stipe's straight right, he realized the best way was to use kicks to tip the body while moving always slightly away from his liver side, as he said catching one of Stipe's straight has finished many HWs instantly... So JJ said he worked up more his opposite side, and that he knew Stipe's chin was world class, but he wanted to test that body endurance for sure and take him down with an impactful body shot.
Weird enough, in his training footage pre fight, he did all that visualization sparring training, which finished with him doing specifically the finishing move:
Here Jon Jones explaining his goal in the fight: