It will depend on if dnc is reliant on partner's weaponskills or just attacking skills as the former would force dnc to partner with the melees and the ranged physical the latter opens all up.

If they rely on weaponskills then i believe best partners order would be mnk/sam/nin/mch/brd/drg due to mnk getting Gl4 the amount of skills in this state would be lovely, sam loves skillspeed so ups amount of attacks, nin has ninjutsu but still very fast attacking job, mch before brd due to looking like its more powerful and drg bringing up rear due to their gcd times being the worst and if tether remains dnc may be far out rather than close(I believe i heard distance may affect potency if i misheard put drg before brd and scratch the part abou tether).

All that is based on SB and the trailer/LL and is also tailored to Substain dmg rather than the opener or burst which might make things more worthwhile on casters who knows XD