1. Some of the information in there was flawed. A sharingan cannot deactivate if it did not originally belong to the user. Not the other way around. If it never deactivated, it would mean that Tobi is either not an Uchiha, or always has it out to be prepared.
2. Much of this is random information that does not support it's theory...or counters it.
Example: "Tobi was always bitter towards the Senju and the Uchiha, so much that it shows that he wants to take revenge."
The elder son of the Sage of Six Paths was the first Uchiha. How could he always be bitter towards himself?
3. He would have died a long time ago. He's an old legend.
4. Their eye patterns are not at all similiar, which you would see if you looked closer.
5. Many people wield swords.
6. Many people have the capability to grow long hair. Saying that he's Tobi because they both at one point had long hair could be used in the other way too: Tobi has short hair so he must be Kagami, or Obito. That is not necessarily true and should not be considered conclusive evidence.