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. He's perhaps the second most significant person in Sasuke's past, next to Itachi.