They look pretty similar and I don't think there has ever been an incident where they were in the same place at the same time. I'm not 100% saying that they are the same person, just looking for discussion.
That could possibly explain why he doesnt fight much because if his style is the same between the two personalities it would be obvious, right?I doubt it, Arima is worlds beyond anyone. And Tatara hasn't really been in heavy battles to prove his worth unlike Arima.