My theory of how this happened is when Kakashi and Rin left the place where Obito was being crushed by the rocks Madara (who we know was still alive according to him surviving battle with Hashirama) found Obito or was tracking him because he knew of the power his sharingan has (You say bizarre...
Is it just me or does anyone else actually wanna see how strong Naruto & Sasuke are by putting them against Madara 1 on 1 each time.? I know I do :D :mugi:WTH