Not sure what you're talking about. I've been #1 dps on horridon in our raid the past few weeks and I still use HA and cleave adds. Mastery is my top damage, and then DS, and I scumbag less on the boss than some of our raiders. Wish I could link the log, but it's private. Damage breakdown was 64% boss, and ~8-4% per big add.
Also, I said sans dks. But hero class, blah blah.