OK I tried this setup, with 2x Crusaders, 1x zDPS Barbarian and 1x zDPS WD. I completed GR70 quite easily, which is not my best (GR79 with the Wizard-based meta-team). However, Akkhan gear is so-so at the moment, not all ancient, no thorns on every piece, not a single Caldesann buff, etc. so there is a good margin of progression there.

The WD is here because nothing can beat him in terms of DPS increase, and the Barbarian is here because I don't know how I can run high GRs without perma Ignore Pain... I will need to rework the Barbarian however, obviously globe generation is useless in this build (save for the raw "healing" part)

One flaw appear, it's how the Crusaders block, or don't block rather. Since the WD is doing a lot of crowd control, the team isn't hit a lot, which is a good thing, but... no block -> no CD reduction from the shield -> no dps increase from the cubed sword, etc. and I'm starting to wonder if Punish/Celerity works as intented.

One good thing is that you don't need to be sitting ducks in "Slow Time" from Wizard and "Inner Sancturay" from the Monk... So teleporting Rift Guardians are less of a problem. Also you can move the team to where an area of power stands (from zDPS' Oculus Rings).

I have been running a build with Slash/Zeal instead of Punish/Celerity, and I seem to get the same amount of "+25% thorns" buffs, and obviously it's more effective with packs of whites. I need to run some more tests however, specially on bosses. Anyway I can do much better because this gear (coming from an old "Condemn" setup) needs to be improved in terms of attack speed (and thorns, obviously).

I need to increase CD reduction too, just because the big numbers are coming from Iron Skin / Reflective Skin and I need that to be up more often. Maybe use a Convention of Elements ring instead of a Justice Lantern, too (I need a Ring of Royal Grandeur and a Compass Rose for this build).