As far as ranked fighters, there was DDP, Brunson, Whittaker, Vettori, Hermanson ect who were there at that time. Not sure why this would even need to be told to any regular on a UFC forum.
Adesanya had Pereira on the ground for an entire round and only got back up because the round ended, and Bruno Silva of all people took him down twice. Knowing that, even guys like Andre Muniz and Malkoun (took Allen down 7 times) ect would've been risky matchups for him.
Until he proves himself as well rounded, he should be nowhere near GOAT convos, especially after a split decision where he was wrestlefucked by a guy like Jan just over a year ago.