Board Thread:Theories and Speculation/@comment-1783334-20150507053750/@comment-4521917-20150511044057

This is kind of a stretch but so is the theory that he's Kagami and Izuna.

What if the man is Fugaku? I know what you're going to say, but hear me out. From the beginning, Fugaku has been portrayed as a man that puts the Uchiha clan above all else - even the safety of the village, and his unreasonable nature leads to the slaughter of his entire clan. In short, he's not really a great guy. Lastly, we don't know what his abilities are. We know he had knowledge of the Mangekyo Sharingan, and that alone rings a few bells. If Fugaku had the ambition to survive, he could have feasibly used Izanagi before Itachi killed him.

It's unlikely, I know.. but if you think about it from a narrative standpoint, Fugaku would be the perfect adversary for Sasuke. His entire childhood revolved around trying to be valued by the guy.