The inside trip got KINDA stuffed, but there was enough umphf to get both on the mat and vulnerable. Cenzo kept Massa's left arm and it was Cenzo with the quicker hips that allowed him to adjust and snare the leg with his right hand and finish.
It was definitely Cenzo's quick hips. And the hips had help.
In order to put weight on Cenzo to take him to his back, Massa threw himself into Cenzo, which wrapped Massa's right leg around Cenzo. That stopped Cenzo's forward-push goal from the trip, true, but it also put Cenzo in something like a suplay position. That is the key point, I think. A guy being Suplayed for the first time might think at first, "woo hoo, we're going down and I'm on top of the other guy, but he discovers that somehow he never actually lands on top of the other guy.
In Cenzo's suplay-like situation, in suplay fashion, Cenzo had contact with Earth, while Massa was in midair. Therefore, on the way down, Cenzo started his quick-hips cat turn, but Massa, not touching Earth, could not resist that, unless he wanted Cenzo on top of Massa upon landing. Massa would have had to disentangle his leg(s) to post his leg(s) to get something to push off of upon landing.
But Massa was not able to disentangle his left leg. Part of Massa's inability was that Massa was not sure what to do; that's what Tikk thinks also. In addition, though, I see that Massa's left leg was also trapped by Cenzo's right leg (from the original trip), so I doubt Massa *could* have disengaged quickly enough to post Massa's left leg to power a push into Cenzo. In addition, Massa could not land on top of Cenzo's chest because, mid-fall, Cenzo had used Cenzo's whizzer to fix Massa's position in the air and then Cenzo used his quick hips to do a cat-turn and get his body beside Massa instead of under Massa. That's the kind of thing a guy doing a suplay can do.
The only thing Massa ever managed to post to push off of was his left elbow, but that was a left elbow and not a left hand, and it was too late and too weak, mostly because of the pressure Cenzo was putting on that post via the whizzer.
To re-iterate: Cenzo's magic becomes more understandable if we realize that his tumble backward turned into something similar to a suplay, which gives the Earth-touching guy an ability to make a cat-turn, and the airborne guy difficulty in doing much, unless and until the airborne guy can manage to post a leg, which Cenzo never let Massa do.