Even if Cejudo beats Sterling and regains the 135lb title again it would be absurd.
It's like 13 title wins (let alone his ONE title wins) vs 5 title wins if Cejudo wins. And they're tied 1-1 where MM had a KO vs Cejudo won a competitive decision that could've gone the other way.
Literally all Cejudo has over MM is the 135lbs title, which yes MM failed to win back in WEC days and against Cruz who Cejudo has beat... but again he has now won one over in ONE.
The math just doesn't add up to ever put Cejudo ahead of MM right now, and it'd take many defences to overcome their gap.
Why would it be absurd? Mighty Mouse was an exciting fighter but what was his quality of competition exactly? Pretty dogshit.
Cejudo is 1-1 against him, they split. Sure you can argue Johnson could have or should have won that decision, but he lost. He also lost to some random in One, he also lost to Cruz, and he drew with McCall (I recall that Ian McCall should have won that fight too right? Some error in points?)
Where as Cejudo has lost to Mighty Mouse, beat him whether you want to qualify it or deny it, and lost a split decision to Benavidez after losing a point (I'd have to rewatch but rarely do refs ever take points so he might have gotten fucked over).
Why would it be absurd? "Title wins"? Cool at FLW the shittiest men's division there is, the easiest division there is to defend a belt. He defended the belt against the likes of: Moraga, Bagutinov, Caraiso, Horiguchi, Ray Borg, Reis, and Tim Elliot.
His "ONE" wins? Really...? Against Japanese MMA fighters mostly who wouldn't even rank top 10 in the UFC? And Moraes who might be decently good but is what exactly against real, top flight competition? Will Brooks?
Time and time again fans overrate the balls of fighters who fight cans and lower end comp. I say this as a fan of Demetrious Johnson, and Fedor for example, I respect their legacies, but they are massively overrated. Honestly, Cejudo's higher end body of work is better than Johnson's. You can argue that easily with wins over - Cruz at 135, Dillashaw champ-champ, Moraes (prime) 135, Johnson himself for FLW title at 125.
The only blemish on Cejudo's record is the loss to Benavidez never being avenged, but obviously he would have dusted him in recent years. Losing to Johnson has no shame. I'm not saying Cejudo should be higher because he shouldn't, but to say if Cejudo beats Sterling he's "not even close" what the fuck? Really?
Name Demetrious Johnson's top 5 wins. Again, some fans tend to overrate longevity and title defenses while ignoring the context of who those wins were against. Fedor beating up retards in Pride like Ho-man Choi and Zulu and shit, or Johnson beating up some journeymen JMMA guys and Borg/Caraiso/Elliot, having wars with McCall and getting gifted a win.
Long post that's rambling but...that's another thing. All these GOATs have psuedo-losses and asterisks too. GSP lost to Serra, psuedo loss arguable loss to Hendricks. Jones probably lost to Reyes. Khabib probably lost to Tibau. Johnson probably lost to McCall, arguably to Cejudo, then did to Adriano Moraes. Stick around and you'll lose - Aldo, Silva, Fedor, Penn, Cruz.
TLDR - I think Demetrious Johnson is an all-time great but at the same time his legacy/resume' is very overrated at this point.