Seal Fate (the talent) won't ever give points on an Evis crit since Evis isn't an ability that adds CPs. ("Your critical strikes from abilities that add combo points ...")

Whereas the Netherblade bonus and Ruthlessness call out on finishing moves as their requirements.

If you have the willpower to scan the majority of this thread I think you'll find this question has been asked a few times. IIRC the reason being that with a combat dagger build going from 2/3 Ruth to 3/3 Ruth does not consistently give you enough extra combo points to actually change your finisher cycle to something that provides more dps efficiently, so the sheet assumes that extra procs from 3/3 Ruthlessness will be wasted considering that with combat daggers there are times when you're at 5/5 combo points, at full energy, with a few seconds left on SnD, and the apropriate thing to do is "waste" a combo point by squeezing in another BS (instead of refreshing SnD early, popping a 5pt rupture, or wasting energy by just sitting at 100 for over 2 seconds).

Common sense indicates that 3/3 Ruthlessness will give you better dps than 2/3 Ruthlessness for short fights where you don't get much of a sustained cycle. But probably not by a ton. Ruthlessness gives better payout to more finisher heavy builds, like Mutilate and combat swords/fists/mace.

Wow, I stand (happily) corrected.

On a side note, I've put in some of the item changes announced today, to see how they shake things up. The buffs to Searing Sunblade make it a very, very good offhand for Fist now (I think with my current gear it was only 0.5 DPS less than the buffed Left Ripper). Midnight Legguards are pretty good now (better DPS than level 70 blues finally), but still inferior to Netherblade.