It's a shame I didn't get to watch the match. Finally I had to watch the replay to see how Ngannou was in boxing. And I agree with you that Ngannou seemed to run out of gas as the fight entered the final rounds. Regarding boxing strength, there is no doubt that Francis will become a great boxer in the future. And for Dana White I think his chances of bringing Francis back to the UFC are almost impossible because the boxer's pay is much greater than even the highest pay a UFC fighter receives.
For sure punching so much will get you gassed out but in the later rounds Tyson Fury was also gassed out as well, and sure Francis Ngannou will have to further enhance his gas tank for the next boxing match for sure he can be shifted to the Boxing without having any problem at all, that performance of Ngannou has really shocked many for sure,
Here are my picks for the UFC Fight Night Almeida vs. Lewis event
Jailton Almeida (1.20) VS Derrick Lewis (4.70)
Many have thought that Derrick Lewis could not make the fight because he was arrested for speeding, but I think his strength will not be too depleted because of that, Almeida is sloppy shooting a takedown so there is still a possibility for Derrick Lewis to take that chance to TKO Almeida but I guess Jailton Almeida can quickly shoot a takedown and take Lewis on the ground fast enough, so it is clear on who is my pick and that is Jailton Almeida
Gabriel Bonfim (1.16) VS Nicolas Dalby (5.20)
For me, Gabriel Bonfim had great striking he could finish his opponent with his strike but when his stand-up gets complicated his grappling is not just a walk in the part, while Nicolas Dalby might have a great record he was briefly taken to the ground as well for sure Gabriel Bonfim can easily defeat Dalby for sure so my pick is Gabriel Bonfim,
Rodrigo Nascimento (1.52) VS Don'Tale Mayes (2.55)
Rodrigo Nascimento has already beaten Don'Tale Mayes in this fight Don'Tale Mayes has the reach advantage and has power in his punch but for this fight Rodrigo Nascimento is well-rounded he had great boxing combination and could also get the fight to the ground just like their 1st fight so for me there is really nothing that will be changing on the outcome of the fight so for sure Rodrigo Nascimento will still win this fight for sure so my pick is Rodrigo Nascimento,