You sound like those delusional Kidd stans rn. Crocodile is a dangerous, smart individual, with a fruit much stronger than 99% of this verse. And he can probably defeat characters stronger than Vergo easily due to his abilities (Jack, maybe even Cracker though that might be a reach).
However, he's never, not once, been depicted as an elite fighter. Even in his retconned form, where Oda was on a revenge tour, he could not handle Jozu's speed. Vergo is far too well rounded to not give Crocodile trouble.
Vergo gives him the boundman treatment in a strict 1v1.
Not only can Vergo achieve speeds that would have Crocodile thinking he's fighting flash, but Vergo hits like an absolute truck too. Crocodile would be fighting for his life, I reckon something along the lines of awakening would be needed if he's not in a suitable environment. Either that or Vergo gets too comfortable, (which is in character tbh) and Crocodile dries him up.