Originally Posted by
kindath
Short answer: No, keep 2+.
Longer answer: There is some synergy with true bearing during Adrenaline Rush, since you'll be using more finishers = more procs and once you get Blurred Time, the True Bearing effect is effectively increased by 15%. However, Adrenaline Rush also synergizes with basically every other buff just as well, and you'd significantly more upfront damage during AR with, say, shark infested waters and broadsides.
True Bearing by itself gives no immediate damage increase.
If you roll for 2+, at one point you will have a combo with true bearing + one other (ideally, one that increases CP generation), but the overall benefit of True Bearing is not enough anymore to be worth dropping any other 2+ combo for.
EDIT: After reading what it says in the icy veins guide, it looks like what it's saying is "if you have True Bearing currently, activate AR - otherwise wait until you have 2+ buffs before you activate AR," which is reasonable advice (though it's probably just as good to use AR on CD)