soulbinds, conduits (and legendary if needed) included or JUST the ability? bcs covenant is a package, so its important to include all...
this is quite often problem bcs people focus on single information and ignore the rest of the spectrum, i have example of that as back as wotlk, when my leader wanted me to go to 10m raid as unholy due to spell damage taken debuf i would put on the boss, bcs thats what was optimal for raid by guides and whatnot, BUT he ignored that we only had 2 caster dps, that would be +5% dmg to each as blood i would do around 20% more dps than as unholy (even though as unholy i did about as much as other dps)...
in 25m i went for unholy as we had 9 or 10 casters so their gain was higher than my loss for raid as whole, but in 10m it would be madnes, yet if we only looked at my dps and nothing else it would be weird that i go unholy when i do much less dps...