Combat Ready part of Resultion buff seems to be spacebar-oriented in PvE, all that "additional skills effect" is PvP-only (PC) according to dev.notes, and i really don`t care about PvP xD
In PvE this JD will for sure feel different from Royal Guard. From what i see- there`s no good AOE clear(3\6 targets is funny if you compare it with RG), spacebar is relying on buffs being kept (so probably unlike RG it can`t be used for afk vesping or similar stuff).
That being said... Both JD and Caisse have buff skills in their stances, and probably both will require lv11-12 on this buffs to be powerful. Prepare your Stance Ring Boxes, getting a whole sets gonna hurt. And imma gonna sit here and wait for Bloody Navy Marchetti using Zeppelin instead of JD in his skills xDDD