Are we 100% on the cold zombie dogs? I did some limited testing and it seemed like my damage was the same using 1 set of dogs vs 4 sets of dogs.
I ran out into the field in act 1, let the dogs hit stuff - noted highest damage after about a minute, did the same with 4 sets of dogs and it seemed the exact same.

BBV does stack, just need to use different runes. The totems that stack are Slam / Rain / Ghost. It adds 60% IAS as well as the 30% increased damage. Popping it on a boss is silly sauce and makes for amazing RG kills.

I only have 2 char with the quetz, but all have at least 2 pc jade and the damage seemed pretty good. The AoE pack clears are just brutal and there is not much defense that this build offers for affix's. If somehow able to speed up trash clears we could get this build to be a high contender.