Just to clarify, I do not believe this is the ideal setup for the majority of bosses. It just happens to be really strong for Helya because of the extreme movement, and free cleave being extremely powerful (same reason Hunters where super strong before the patch). I would not suggest running it for most other bosses, I just did it to test it some more.
About my ranks, only bosses I actually played well on was Guarm and Helya, the rest I was just fucking about (tanks didn't let me cleave in p2 on Odyn ;_
. However, I definitely do not think I would have gotten many rank ones in EN anyway, although the spec has the potential to top both Xavius and Nightmare Dragons.
About the legendaries: I literally just used those two because I thought it would be funny to get rank 1 with them. And as mentioned, it is not like they are terrible. IFE and LC are better for the build in general though.
Oh, and for everybody thinking I just padded. Nope, also got r1 boss dmg for boomkins:
https://www.warcraftlogs.com/ranking...metric=bossdps