He was buried under a shit ton of rocks, and it all happened within a few minutes. So you're telling me that he was resurrected or rescued in the space of minutes? That would take planning and foresight, like Madara KNEW he was going to get crushed by a bunch of rocks so he would have the opportunity to turn some no-name Uchiha. Do you not understand how ridiculous that sounds?
You're right, he was the main character and the most important Uchiha.[/sarcasm] Obito was one of Kakashi's teammates, who was always late, always sucked at techniques (like Naruto), and was terrible at doing what was necessary (except at the very last minute, when he awakened his sharingan and teamed up with Kakashi to save Rin). Not to mention he was only really featured within an extended chapter in which he DIED. At best he's a supporting character in a five chapter side story and has really no importance as an Uchiha.
Again, we're talking about a character who was killed in the only mini story arc he was in. 'You let rin die' is not enough for a side character to all of a sudden develop this evil plan to enslave the world in the name of peace, especially when it's completely contingent on an event (rin's death) which did not happen in the time frame of minutes that Obito would have to be rescued/resurrected.
It's like Kishi expects us to think Obito died (but not really) and then some time later Rin dies, and then Obito was just hanging out someplace until that happened in order to devise some plan to enslave the world. That's so convoluted it definitely ruins the story.
He snuck into Konoha without tripping their barrier detection, killed all the Anbu who were guarding Kushina during birth, and took baby Naruto hostage without Minato even realizing it until it was too late. Then he managed to abduct Kushina and almost kill Minato AND baby Naruto in just a few seconds.
If you don't think that he's was an S class ninja at that point, you're fooling yourself.
Madara has never had a reason to wear a mask, and if he were to come back and attack Konoha and devise this plan to enslave the world, do you honestly think he would put a mask on? The only reason to wear a mask is to hide your identity, which is not something Madara would do in the first place, especially when he goes around telling people his name.
No, the masked person who attacked konoha was the very same person who is claiming to be Obito now. And Obito's body is just another mask to hide who that person really is.
Obito is a no-name and that story arc is a filler chapter. The only difference between that arc and any other filler is that Kakashi references Rin and Obito outside of Kakashi Gaiden. Now Kishi wants us to believe that this no name Uchiha is somehow this super villain who became a super villain because Kakashi broke his promise to protect Rin (another no name character, one who doesn't even have a last name), even though Rin's death happened after Obito's death and in order for Obito to become a super villain because of Rin's death, he would have to go back in time and not die so he could see Rin's death and then devise this super villain plan to enslave the world.
Yeah, it's all BS and I don't understand how people give Kishi any credit for it at this point. The only logical conclusion is that Tobi is really someone else who's just using Obito's Body and trolling Kakashi to throw him off his game.