Again with the old argument that 'Sharingan can't see Mu's invincibility'. Its a real bother to explain, and I don't get why people refuse.. Sharingan can see chakra. No matter how good Mu hides it, he cannot erase it considering it will lead death. Every living being posses chakra within them, Mu's technique supresses his chakra to the point it cannot be sensed.
Sharingan has the ability to see chakra which means if Mu falls in line of Obito's line of vision, he will be seen. But then again Obito needs to look in the position Mu is at to see him, he cannot sense him with his other senses than his eyes. Which seems to put him at danger but it actually doesn't. Mu's chakra hiding technique is more like a defensive technique, when he uses it he cannot perform other ninjutsu. If he tries it cancels his invincibility considering he needs to draw more chakra.
Mu can drag this fight a little but he loses in the end. Since its full intel, which means Obito is aware of Mu's splitting as well. He can win med diff at most.