The Definitive Dark Knight Guide

[Sweetgrass]

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You don't gain them, you lose them at the start of the fight and don't get the potency back, that's the case with every single optimization in this game.

OT = offtank = enmity is not relevant, let alone other glaring problems like starting with Unmend.

You missed m'point entirely, and I actually made a mistake earlier: Holding DRK skills at all is not viable. Waiting any more than 6 seconds for Trick Attack is a pps loss on Carve and Spit, which isn't actually possible, even with Fey Wind + the most GCD-clipping Suiton rotation possible for a NIN.

Yes, that's double evidence for why early CnS is optimal.