As far as the list of names goes that either man has beaten, I think Adesanya already beats out Anderson. However, where they differ is in two areas, one being title defenses, and the other being the way in which they beat their opponents.
Izzy has beaten better guys imo, but he hasn't done so in the same flashy or decisive manner that Anderson consistently did. Sure, he beat Romero, who is arguably better win than anyone Silva ever beat, but it was an uneventful fight that pretty much everyone agrees that neither guy deserved to win. Izzy's best win is easily Whittaker, and that's another win that's probably better than any of Anderson's. That one was impressive, and he finished that fight, but one win doesn't change everything, it's not enough to overtake Silva overall.
So yeah, Anderson is still MW GOAT, it's not close, even if Adesanya has another 2 or 3 title defenses he won't be close, and it's because Anderson has so many more defenses (literally the hardest thing to do in MMA is defend the belt), and Anderson also has way more impressive finishes.