ohhh come people? if you think about Rin was a medic? she could of took the other eye for herself because she felt so sad that obito loved her and she did to but didnt relise till it was to late?, and then somehow madara found her with the eye and used her for his plans? IT COULD WORK!!!!!!!!!!!!
If Tobi is Rin she would terrorize iwa not konoha she has no reason to hate Konoha and would rather haunt Iwa-gakure because iwa-nins killed obito (obito has no good reasons too so I think he isn't tobi also.^^)