I am learning the game myself now and can let you know how we are playing in relation to your questions.
1. When adding a groups fight stat we just use the base stat but take into account stun and damage modifiers per model. We don’t take each models weapon bonus into account because from the rules it seems only one model is attacking and the others are helping.
2. Slaine’s price in Notoriety is 16 + 9. We add the Slaine and Warped Slaine together as they are both available once Slaine is on the board. Slaine can not start in warped state and must use his card to warp.
3. We add the power in the hitting step and not the hurting step.
Hope that helps. These are just how we interpreted the rules so it would be nice to get an official FAQ or something to these questions.
