I think each Commander have an Ability that makes them counter certain Category of People
Van Auger is a Sniper who can't be Sniped
Doc Q is a Doctor who spread Disease
Burgess is a Wrestler whose Strength keeps increasing
Shiryu is a Swordsman who backstabs
Devon is a Hunter who tricks Hunters
Wolf is a Giant who grows bigger than others
... etc
This fits their Theme as Corrupt People and Cheaters, Opportunists and Cruel Crew
In other words we have a Sniper who counters Snipers, Wrestler who counters Wrestlers, Doctor who counters Doctors, Swordsman who counters Swordsman Code, Hunter who counters Hunters, Giant who counters Giants ... etc
So Pizarro counters Royalty or something related
Vasco Ability related to Drunkards
Laffitte Ability related to Acting