Because Tobi is from First hokage generation and Obito was from Kakashi generation.
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After Obito died Orochimaru found the body of obito and placed Madara Uchiha's mind into the body.So that means that it was actually Madara who fought the 4th hokage.
Yes it is true that Obito Uchiha is tobi as shown in Manga Chapter 599
tobi did when he used full sharinjan and when the 4th hokage broke half of tobis mask he used every thing i think
kisame assumed madara was the fourth mizukage , after all fourth mizukage yagura was actually manipulated by madara/tobi ... so you can assume that madara was the real mizukage and yagura was just a puppet ...
Kakashi, Obito, Rin and Minato Namikaze (the leader) were students in the same team. Obito dies and later on it emerges that Tobi is, in fact, Madara Uchiha. No because obito is not Tobi .madara uchiha is a man from before the hidden leaf he is probably hundreds of years old madara was born before kakashi they can not be the same age because Kakashi is 27 Well as shown now tobi is not madara. However there is no way tobi could be obito cause at the time where the nine tails attacked kakashi was still young and tobi was way older when he fought minato. I dont get why people are not using their brains cause that is a proof that tobi is not obito.
Tobi and Obito are not the same person. Tobi is Madara Uchiha. It was confirmed by himself. He will be unmasked later in the series.