DP, good on two enemies?
I don't think so... If we're talking about DADP, you'll use 4800 mp/ ~9500, it's more than the half.
With that, you'll just have enough to use 1 DA or 1 TBN more, but the fact is: with Blind effect of DADP, BP gain will be divided per two, and the chance that TBN "Proc" will be very reduced.
Quietus is very, VERY more useful for pack: cost 50 Blood, so 1 TBN, which is very useful during pack because it's a 20% hps shield + it will proc, so you'll have you 50 Blood. And even if the TBN doesn't proc, you have BP + Salty Earth + your SE combo.
Quietus, even with only 100 dmgs/ enemy, give you some mp, that can be used for: a new TBN; a DAAD, which makes a lot of dmgs + hp recovering. And if you have 85-90% of your mp just before a Quietus, it's worth to DA it, and is potency become 210.
It's almost an aoe rotation. And DADP, or just even DP, breaks this rotation.