How come Mr. 3 is above Mr. 4?

[Fantastische Hure]

This is purely going-off what I remember about the Mr. 4 fight but Mr. 4 (the one that fought Usopp & Chopper with his partner and dog/canon) was way stronger and dangerous than Mr. 3 yet he was ranked below him. Could be because Mr. 3 is more of the thinking type and as a result a different type of dangerous. Makes more sense to place someone higher-up the status because of their brains I guess but still Mr. 4 should technically blow him way out of the water just because of his strength alone.

Also kind-of unrelated but when Vivi explained the ranking in the organization she said the female members that are partnered-up with the agents have similar strength to their male counter-parts, but that makes no sense to me there's no way Mrs. Doublefinger ~ Daz Bones in any universe.

 

[Captain Cadaver]

Crocodile explicitly stated Mr. 3 was inferior to Mr. 4 in strength and the only reasons he ranked him above 4 being because of his intelligence and reliability.

As for the female partners, Vivi was likely talking about in how the females ranked on their own in comparison to the other females, as well as how their powers complimented their partner.

 

[Fantastische Hure]

Not very reliable, if Crocodile without hesitating sent Mr. 2 to assassinate him.