Look for Barblyu, Silvermoon.
Can't post link yet, don't have 10 posts D: (10 posts YAY !)
MM (90 sivara) :
https://www.warcraftlogs.com/charact...lyu#spec=Frost
HM (97 average) :
https://www.warcraftlogs.com/charact...y=4&spec=Frost
Myhtrok is my char, using Obliteration, 86% on Sivara, with far from perfect trinkets (Mechagon wheel and Inkpod, both easily outmatched by Coral and Font of power), while raid leading, and doing quite a lot of rotational mistakes (my RW usage is trash, I sometimes fail using my CH during PoF, a few rune overcapping, etc).
I also don't have Dream's End (~1% dps increase) or a third essence, which a fair part of the top parses have now. I'll be trying Icecap since I got some more crit and Oblit scales poorly with that stat.
What I mean is we're not the best players in the world, with the best gear, and some guy could probably outdps by a good margin, even if we're already doing alright. So saying no other spec is viable when some guy do good with other specs is wrong.
Edit : Tbf Barblyu only has 97 in HM, some parses are in blood specs.