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So I am arguing with a buddy and now I am utterly confused. How exactly is damage resolved when doing a simple CMA or cra with two mat6 pow10 attackers? is it mat8 pow 12 or mat7 pow 11 aka is it regular pow + number of all participating models or pow + number of additional models?

From memory, it's all attackers.

edit: so mat 8 pow 12

Mat 8, Pow 12 is correct - you add the total number of attackers. It's partly why 2 man CRA/CMA's tend to be popular.

Each model participating in the CMA/CRA, including the model making the actual attack, adds +1/+1.

So Mat6 Pow10s become Mat8 Pow12 with a 2 man CMA/CRA.

Note also that it doesn't actually add to the Mat and Pow stats, it adds a bonus to the attack and damage roll. So any AOE blast damaged will be halved before figuring in the additional bonus. So if it was a 3 man CRA and the base pow was 12, the blast damage would be effectively pow9((12/2)+3=9. Not (12+3)/2=7.5 round up to 8)