I have an ide aof who tobi might be i belive its Kagami Uchiha, Danzo`s old teamate and these are my reasons
1. age/body type -- the body type is about right coparing to the idea of just growing up in genrel
2. motive, -- his whole clan was killed because of violence and tobis idea of peace could have stemed from that idea
3. possible died in the massacre -- we never get any real proof he died in the massacre of the uchiha, he could have easily spied on his old teammate danzo and heard about it and ran to safety to get his revenge another day
4. new and old --- i bet the tobi who fought the 4th is a completly different tobi then the one we all know now and the current tobi knew of what happened that night between the 4th and tobi and decided to use the name tobi
5. the eyes -- kagami is an uchiha and he does have the eyes of them
well those are some of my reasons i may have more at some point and ill post them in as i research alittle more >.> and no not Jiraiya kind of research
ok maybe just a little of that type as well