It sucks Francis is gone. Tom vs Ngannou would be fire.
Nah. You looking the wrong direction. Alex Pereira vs JJ would be fire. Ankalaev vs Jon Jones would be fire. DDP vs Alex Pereira would be fire. Don't look just at size and think it's the standard for best. LHW is the premiere division because it balances height and skills very well. So much so DDP, Chimaev, Alex Pereira, Ankalaev, Reyes, Rountree, Jiri... They're fighters who got way more attention, exposure and analysis than any heavyweight unless very old era... Because the skill set is way bigger there. When someone who does well in a weight class, but cuts weight, they generally do better when moving up, because generally, the lowest the weight class, more skilled they are.
That's why Ngannou said Alex Pereira would definitely be successful at HW and possibly get a belt there even tho he knew JJ and Tom were in the picture. Francis said "He'd definitely be successful there. Get the belt? Maybe. Keep it for how long? I don't know. But yes, it's very possible he gets the belt moving up" ...
Gane was the #1 contender when Francis left. JJ defeated him within a round when he adapted well to the weight. Meanwhile, LHW was not easy, he needed to dig deep on many fights. DC also struggled in LHW. Yes JJ was the main thing, but Gustafsson was a hell of a fight for him, a classic split decision win that could go both ways... And other guys outside JJ gave him a hard time. He moved up at 39 year old, and defeated one of the top guys there, Derrick Lewis, in 1 round. Defeated Stipe first fight in a round and lost the other 2 matches, but the other two were all tough , very rough fights for Stipe... And DC was 42 years old. Yeah it doesn't mean much, but a DC who fought Gus was better than the one who got the belt in HW, and Stipe was like a Gustafsson there... Stipe was also smaller generally than average HWs, not for nothing he was seen as the most complete HW, because he was an all rounded fighter who had great durability, great fight IQ, great wrestling, heavy, very heavy power punching with accuracy... He was 6x world champion there, he was a HW with LHW skills.
When Ngannou was comparing, just recently, Stipe Miocic vs X fighter in who was better/who would win, he said Stipe without even thinking twice for Cain Velasquez, Overeem, Junior dos Santos, Brock Lesnar. As for Stipe vs DC, he paused a little and said "Stipe". When asked Stipe vs Tom, he said Stipe without thinking twice. Then Stipe vs Poatan'... He paused and said "Stipe, maybe... This is a tough one. But for now Stipe, but who knows". Then Stipe vs JJ he said "hmm they will still fight, right? But I will say Stipe because I'm rooting for Stipe haha"