This has already been discussed in multiple threads. A sampling:
https://www.dual-boxing.com/threads/...ing-4-warlocks
https://www.dual-boxing.com/threads/...x-Warlock-Comp
https://www.dual-boxing.com/threads/...ll-caster-comp
It is still early enough that there are not many teams overall to cap so there really isn't a lot of data.
Some observations in those threads:
Lots of concerns with Warlock Pets holding Aggro and it does not generally appear viable with the possible exception of including a Paladin in the group giving the pets Ret Aura and the Warlocks -30% Threat. The side benefit is that, if the Warlocks do start taking aggro and getting hit, you can switch to Concentration Aura and stop all normal push-back making 3 Warlocks' DPS closer to 4 Warlocks suffering some push-back.
One approach discussed was having the Warlocks go max Soul Link build making the Warlocks so Tanky that you don't really care when they take Aggro but this has not yet been proven to cap.
My respectful recommendation would be to hedge your bets and try for full AoE with Pets Tanking as follows:
3 Warlocks+Priest+Paladin (reducing Threat on party & Retribution Aura to Voids unless Concentration Aura is needed);
If the pets end up not working out you can switch to a more standard:
PaladinTank+3Warlocks+Priest
Alternatively you could swap in a Mage but then you would only have 1 Void to Tank if you use the stam buff pet (or 2 without the stam buff pet).
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