ok so i decided to take the time to completely research obito and tobi to compare them. so im going to lay out some pros and cons about the whole tobi=obito theory and let you choose for yourself if tobi is obito or not.
Pro:
as you can see the rock doesnt seem to be fully crushing his right eye all the way meaning it may have still been in contact. BUT......
Con: if it did crush his right eye it seems HIGHLY unlikely he would be tobi because reviving and entire right body/face seems like a difficult and unlikely task to be done. Keep in mind that the rock did crush his entire right body which is quite hard to heal.
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Pro:
this pic shows that Tobi has some nuts and bolts on both his arms (i checked his other arm and it has nuts and bolts also) and his waist which could clue in that OBITO may have been technologiacally fixed.
Con: these nuts and bolts could just mean nothing and are just a part of his outfit and since there on both arms and not just his right one it could just mean nothing.
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Pro: Many say that Tobi is immature and very playful just like Obito was and they have similar personalities.
Con: If Obito is Tobi then he would be 29 by now (i checked) and you would think he would have become more mature by now and act like an adult.
Pro: Although Obito would be 29 by now he could have suffered an injury to the head from the boulder that made him still think and act like a 13 year old.
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Pro: Both Tobi and Obito have the same hairstyle and Tobi has a mask covering his whole face except his RIGHT eye. There names sound very alike which could all be a clue that Tobi is indeed Obito.
Con: Lot of people have spikey hair in naruto and it just could be a common coincidence that they both have spikey black hair. Kishi could just have wanted us to think it was Tobi was Obito by making the names so obviouly similar.
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Pro: Many think that Zetsu found Obito and saved him and that is why Tobi was the subordinate of Zetsu when we first see him. While Obito was under the rock Zetsu could have just appeared with his ability to merge with rocks, ground, trees, etc. and saved him.
Con: FACE IT Obito died under the boulder and the cave broke in and he was crushed by all the rocks. Why would Zetsu be in that place anyway? It makes completely no sense and Zetsu doesnt seem like the type who would just save a random person out of the blue.
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Well thats all i got! Now its up to you to answer the unanswerable question......IS TOBI OBITO!?!?! You decide :laugh
Hope this guide was helpful is helping you choose :teeth