Pld Oath's on GCD

[Lambdafish]

DV provides the most powerful mitigation advantage, doesn't cost dps to use, and doesn't require a target, but has the lowest uptime by far.

DV also requires a cure, so either the healer has to provide one, or the tank has to waste 3 seconds clemency/curing themselves. The key distinction between these 3 skills that makes SP much better is the fact that it is the only one that can easily be done as an OT (which could be fixed by giving it a bonus if hit from the front, but of all the problems that tank balance has, this is low on the list).