You see webbing but I just see veins and like Minty says, looking at Laboon, this is clearly after the SH’s have been there so He’s locked up already. He’s been locked up for 13 years. So it’s not him. Or it’s a continuity error. Did Denjiro/Kyoshiro manage to leave? But his hair was already changed... so it is likely just someone else from his crew that he sent out there to visit/a long lost friend since Roger’s crew were on Wano once upon a time. But how did they get out? That’s the real question... the borders are supposed to be closed. Such a mystery.
What else allows for the vast majority of the gap between the thumb and index finger to be connected? I'm not talking about the veins, which are abnormal too. There is webbing between the first two digits.
Kawamatsu being in jail is the direct contradiction for sure, so I'm not arguing against that. I think we don't get an answer because Oda saw the flaw in the main plot and changed Kawamatsu's character design. It seems like this "continuity error" where the old version of Kawamatsu gets dropped into the One Piece timeline for the cover story only.
The hair and build now contradicts Denjirou. There are more breadcrumbs indicating Kawamatsu. Thus, we probably never get an answer and the main plot keeping believability/connectivity takes priority.
Plus Denjirou cannot be the person because this makes him suspicious to Orochi. So actually, the breadcrumbs are only for some random person (has to be a new addition who magically is close to Roger's crew) as the main alternative with no contradictions.