Vergo=Leonidas of the 300, gates of hell
Interesting, Vergo was the head and leader of G-5 right? Overall the G-5 had 6 warships(I assume 7 since Vergo had his own warship and each unit had his own, Vergo was the leader of all unit with means he had a own warship)and let assume VA Vergo had one warship, VA Smoker one and Commadore Yarisugi had one.
Unit 1: Viceadmiral Smoker(strongest VA after Vergo)
Unit 6: Commadore Yarisugi
With means we never see Unit 2-5 and judging with the fact that Yarisugi as commadore as last unit,it would mean the other units where at least pose by a navy soldier who was above commadore lvl.
Let assume unit 5-4 where rear admirals, it could mean unit 2-3 could pose by guys who where pose by vice admirals.
Overall it would mean Vergo was the leader of 6 warships and probably over 2Viceadmirals. With means he had a big Position under the navy control.
As example G-2 had only one Viceadmiral as Comil who was the leader.
Means a lot that G5 was a big base for the navy probably one of the most important base position in new world. Make sense why Doffy put Vergo into that position.