Because he’s the guy who lead that “warrior crew”. It’s not normal crew which can be leaded by weak, it’s a samouraï crew.
But we know the hype around Kin'emon is false too.
MULTIPLE PEOPLE say Kin'emon is the chief strategist as the leader. From the scabbard themselves to Hyogoro to Orochi. And yet it's false hype. He's fuckin dumb. How come he remains the "tactical genius kin'emon" and he remains the "leader" yet he's fuckin dumb.
It seems there'd a bunch of false hype here. And the scabbards even knew it was false. And they continued letting him be the leader.
Okay lets put it like this, Kin'emon doesn't have feats against commanders. Him cutting kaido is not A commander level deaf because KIKI can do that. All the scabbards can do that. Kin'emon cutting fire is not a commander level feat. That's a technique. If he fights jack, that entire fire cutting technique would mean nothing.
He has no feats and his hype as the "leader" is proven to be false