I guess Kaiji switched costumes with his out of nowhere childhood friend.
I know, that on top of excusing someone who was exactly in Kaiji's old disguise then saying "I definitely won't let you get away", while Kaiji totally gets away makes me face palm a little. Endou please! He has no reason to think Kaiji knows helmet guy but I think he should have maybe sent one of his men after him in his car to really make sure it wasn't Kaiji. That all said, I mean, he... is totally sleep deprived right now so I'll accept he's not perfect.Lol @ letting the helmet guy leave without checking who it is... well, maybe the mangaka wants to make readers believe it's Kaiji. But in any case, that's a really stupid move from Endou's group.