Caffa et bucella per attractionem corporum venit ad stomachum meum.
Look at the wording of the damage prevention ability of all the Quaxos Creatures...
[This quaxos creature] takes no damage from opponents attacking with Quaxos Creatures.
The key words here are "from opponents". The wording does not say "from other Quaxos Creatures".
So if among the attacking creatures there is at least one Quaxos creature, all the damage dealt to all the defender's Quaxos creatures is prevented (up to their defense values). And thus there is no need to worry about what point of damage comes from what attacking creature.
What's your opinion here?