It makes zero sense for the PLD class to have three different skills for AoE

[Khalithar]

Seems like we kind of have that already with CoS, if it simply left the ring of swords in the ground and periodically damaged upon area-entry any enemies not already afflicted by CoS's DoT.

I haven't played WoW in a while so bear with me, but I think by making it like consecrate they're asking for it to have the same duration/cooldown. If I remember my WoW abilities correctly, consecration had something like a 12 second duration and a 10 second cooldown. It was part of your aoe rotation to always hit it on cooldown as it would provide great threat and damage with 100% uptime.