The Finger Chopper (spoiler)

True, but he was obviously the less-skilled of the three and he just didn't seem to be the sort of guy who would chop peoples' fingers off. He might've been a criminal, but he wasn't sadistic.

There were several hints that the Weird was the Finger Chopper in the movie. There was the very obvious flashback by Chang-yi and the fact that he seemed very fixated on getting Taegu (and not the map) even though he's supposedly just a petty thief. Taegu laughs in a manner very out of character (sad and bitter) when Dowon tells him about the Finger Chopper, and even mentions that that's not the Finger Chopper he knows.

And despite his goofy mannerisms, he managed to beat 4+ Manchurian soldiers, escape from Chang-yi's gangs in the train, survive the ambush by Byungchoon's bandits, survive the fights against Chang-yi's gangs again, escapes the opium den, survive the gigantic chase by everyone, AND win the Mexican standoff at the end. Plus, another clue is that the guy who tells Chang-yi where Taegu is (the one that gets his mouth cut open) say that no one who confronted Taegu lived, and that Taegu always somehow survives.

AND Chang-yi freaks out and kills one of his men when he says that he heard that Taegu is the best fighter in Manchuria.

Numerous clues, though understandably not caught on by most audiences since this isn't exactly a deep, thinking-man's mystery piece.

Does no one here watch anime? Trigun anyone, its a classic cliche or stock character if you will to have a God level skilled character act like a buffon even in the worst situations. I actually suspected he was finger chopper when Bad's man asked what really happened.

Or i Guess if you dont watch anime, Usual Suspects comes to mind.

The movie doesn't even have a complex enough plot to conjure 50 plot-holes, so get off it.