Quote Originally Posted by fahoumh
Yeah, but you just said "sentience"....you never mentioned anything about reason.
part of sentience is the ability to reason and understand the consequences of your actions. it's not like a bijuu either is sentient or not...there's definitely degrees. the last one deidara and tobi defeated seemed to lack any though. if not for the ability to speak, then i dont know what; but shukaku is on the higher end of the scale.