I think that the Lord Hokage is in fact not the father of Uchiha Naruto, who could in fact beat all the other lord hokages put together using his mangekyou sharingan.

Speaking of that, I think that the 3rd Mangekyou sharingan user is in fact Kakashi because after all he IS a true Uchiha

Also, Itachi did not kill his entire clan, it was Hyuga Sakura with her byakugan

There is no point in debating this, as it is 100% correct