if removing his arm bones makes him unable to use his left arm, i don't really see the advantage. he could've just busted out a sword or used a kunai.

having one arm eliminates:
1. hand seals (unless he is like haku)
2. one less limb to block with
3. one sided attacks (only the right hand can attack)

but if he can still use his boneless arm, then i guess he's the winner. :/