That makes absolutely no sense why just because its free is the HB worth worth 45% more ... you are working on GCD to GCD anyhow you almost never out of runes if you setup the way we suggested. Sorry the free HB is worth exactly the same with or without rime.
Plz note I am not at all arguing against obliterate when the numbers show it would give more damage .. infact my numbers are trending to end up in sync with EJ's. The problem I see is the range on EJ's details are very narrow like you must be in alot of heroic gear and they really don't discuss or publish the range of there results.
The fact is my advice is correct for probably 80% of dps dk's because they aren't in hard core raiding guilds and I make that very explicit. I fully suggest that hard core raiders seek advice EJ's because I really do not have any data.
It's the same story with the whole rune power changing which attack to use in low level gear it's all crap it moves dps like 100 DPS. I looked at it and it soon became apparent it isn't worth even looking at and you just ignore now that is not true in BiS gear given what they have shown in detail.
** Remember Warcraft players fail in directions you never thought possible.