Because it's a lot more versatile?
Locked up guy could be Mukuro's true form, which is actually Byakuran's twin, who will betray Tsuna to fit the backstabber role that Chrome doesn't have, and it would still be alright, because while it's guessable, it doesn't have to be that way.
I don't read Medaka Box, so I can't go very in-depth here, but...
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bullshit thatīs been used more than 315312 times already
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care to elaborate?