I realize I'm handpicking to fit my narrative, but I'd contend it's still relevant data. Adesanya arguably lost to Vettori (I had Izzy winning), who while on quite an impressive streak, still isn't in the contender conversation. Adesanya didn't stop Tavares who's been finished by Whittaker, Boetsch, and Shahbazyan. Adesanya barely beat Gastelum, who's a pudgy WW who got beat by Weidman and thoroughly dominated by Hermansson, each of which is probably minimum a win away from title contention. Adesanya also won a 29-28 against a completely washed up Anderson who's essentially lost badly to everyone the past few years. And then you have Romero who he completely ran from after tasting his power in the first round (and IMO lost to).
Adesanya acts and talks like he's had a prime Jones type run and that simply isn't even close to the case.
You could do this for most fighters if you wanted to, though.
Costa : arguably lost to Romero, Hall is a .500 fighter in the UFC, Hendricks was post USADA and up a weight class, and then a bunch of people I never heard of.
Usman : beat a UFC journeyman on 6 days notice, Colby was a pretty good win, Woodley was washed, Maia was 40 years old coming off 2 losses, RDA is a .500 fighter at WW, Meek only has 1 win in the UFC.
Khabib : Poirier is a pretty good win, Conor only has 1 win at LW, Ragin' Al is a real estate agent who took the fight on 2 days notice, Barboza has a ton of losses, Johnson has a ton of losses, etc.
I don't really believe most of that, I'm just making a point. I'd agree it's not the most impressive run, but it's also not over yet. He could run through Costa, Cannonier, Hermansson, Whitaker again, etc. and then he'd pretty undeniable. Or he could lose to Costa and fall off the face of the earth and we'll say it was a flash in the pan. Time will tell. But he can only fight the guys put in front of him and so far he's an undefeated champion.