Okay.... STFU!!
We all know that Tobi has Sharingan, but every time we see his sharingan it's always Activated. and we've never seen him with MS or EMS....
Kakashi and Danzo both are not able to turn off there Sharingan because they are not Uchiha.
So if you F**King think about it, Tobi Is Not of Uchiha Blood, meaning he is not Obito or Madara.
Also he cant be Obito because he fight's the 4th when there are still kids....
so if you still think that he is Obito that you are
F**king DUMB!
You mentioned kakashi and danzo as an explanation for it always being active. however, for both of them it drains their chakra very quickly when they use the sharingan. that's because they are not actually uchiha. tobi does not suffer from this effect when using his sharingan so he must be uchiha.
Well you can't completely rule out that he is not of Uchiha blood, because almost everytime we saw Itachi his sharingan was activated. He could turn it off, but he kept it on, maybe Tobi does the same thing, never let's his guard down
this is also proof that he can still be uchiha even though it is always active. itachi only ever deactivated his sharingan when he was completely drained of chakra, like when he was fighting sasuke
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or when he just used his ms and didn't want to further go blind, like after using tsukuyomi on sasuke and amaterasu on the frog prison.
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and now as for the original post:
it can't be obito due to the same reason that many people posted regarding the age issues. Obito would have been a young kid during the fox attack if he were still alive. However, tobi had been an adult when he attacked the leaf.
i think that it is madara and will continue to think so until there is strong evidence and proof, that means no speculation garbage, prove otherwise. madara gained the ems, so that alone would make him able to survive.
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he is able to survive, and be an "invincible immortal" because he has an ems. he is still alive because he is immortal but he is a shell of his former self after his fight with the first hokage. This limits his ability to use the full power of his sharingan but does still keep him alive and able to use the time-space jutsu.
the entire argument against madara that you gave to start this thread was based around kabuto's summon. you said it can't be madara based on your assumption that the summon was madara. which until we see the summon, that is huge speculation and a prediction that you can not base any facts off of. there are plenty of shinobi that would scare madara, such as izuna this would scare madara for many reasons:
1. it's his brother. who wants to fight their brother?
2. they were said to be equal in every way, except that madara was older. so now that madara is a shell of his former self, the revived izuna would be stronger than him.
the summon could also be the sage of the six paths or some shinobi that we have never seen before, seeing as many shinobi have been revived that we never heard of, such as ginkaku, kinkaku, gari, paku, the seven swordsmen, and the former kages.
so... i think that just about covers everything