Changing your voice is a pretty basic skill in Naruto.I still kinda refuse to believe it was him. Also the fact he could copy Madara's voice perfectly?
I'd say in the same way Zetsu can log great Ninja battles that Guruguru could store voices and work as a voice modulator. Honestly not that ridiculous in a world like NV that made Obito as a 14 year old sound more gruff and adult than Vin Diesel.
im sure swirly didnt exist in the series before ch 600 or we wouldve seen him.It couln't have been Spiral Zetsu. SZ can only control a body when it's fully wrapped around them, but when Obito had the orange mask and acted silly, his hair was visible.
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He deserves an Emmy.He could act so nice and yet it did not make him think to stop pursuing after Madara's goal, well and his. He must be quite a goooooood actor.