Seems like it.
I always thought it was for the kamui pattern but...I guess not.
maybe he still had that white zetsu covering him when he was goodboy tobi and then when he shed him he quite acting weird lol
Maybe idk but i don't think he would have to wear two mask tho...something had to happen to tobi/obito that the white spiral zetsu does not exist any more right??? maybe died after that fight against the fourth hokage since Im its pretty obvious that obito had to be wearing the spiral zetsu as a armor to take on the fourth..maybe the damage they took resulted on that zetsu death? just a guess. or maybe he became one with obito pretty much became obito right side of the body.