Minimal effort delve job is probably COR, since most groups would want COR to /WHM and help with haste and erase. You don't need to land light shot to enhance dia, so you don't really need to skill up on this job either. If your group has strong support they may let you DD, but until next update COR dmg contribution probably won't be higher than going /WHM. Your BRD needs to sing different set of songs just for DD COR if COR wants to DD, which makes delve boss run harder to organize. All you ever need to do is roll roll roll and haste erase and that's it, which doesn't require awesome gear to do.
However this job may not be most desired because everyone has it, and does not have high gear requirement.
Edit: You're probably better to use a COR mule for double plasm gain if your group has strong support. So yeah, still minimal effort delve job.
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