I think Obito's sharingan is very powerful for some reasons.
He can use kamui.
Kakashi Copied 1000s of Jutsus with his eye which made me think obito also copied madara's Jutsus in no time and had some special abilities like copy jutsus fast.
Madara Realize that Obito is very strong and he is the only one who can help him.
If he had both eyes then he could be unbeatable.
4th Hokage was well aware how dangerous he is.
Edit: not every Uchia copied many jutsus like kakashi did. Kakashi can execute the same jutsu before even user does it. We never seen other uchia doing it. I am not saying He can copy jutsus but He can copy Faster and better than other uchia and master all the jutsus.
He can use kamui.
Kakashi Copied 1000s of Jutsus with his eye which made me think obito also copied madara's Jutsus in no time and had some special abilities like copy jutsus fast.
Madara Realize that Obito is very strong and he is the only one who can help him.
If he had both eyes then he could be unbeatable.
4th Hokage was well aware how dangerous he is.
Edit: not every Uchia copied many jutsus like kakashi did. Kakashi can execute the same jutsu before even user does it. We never seen other uchia doing it. I am not saying He can copy jutsus but He can copy Faster and better than other uchia and master all the jutsus.
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