Board Thread:Theories and Speculation/@comment-3001903-20150829033326/@comment-5407586-20150926212738

Blaze Release is pretty much Fire Release of the highest level, according to the 3rd and 4th databooks, with the former classifying Amaterasu as the highest level of Fire Release and the latter classifying all of the "Blaze Release" jutsu as Fire Release.

About Kakashi knowing of the Mangekyō-induced blindness despite apparently never having used it at the time, it ain't like there were no info at all about the Uchiha clan's dōjutsu in Konoha. Kakashi learned to use Kamui in the timeskip, as stated when he told Naruto and Sakura he had "invented" a new great jutsu right after Naruto's homecoming.