Yeah i don't disagree that DC are pretty straightforward in all books(CC,HSBR,HS6EV1,2) what is not straightforward in CC is the concept off adding damage to Advantaged Attack Powers.
For example if we follow the instructions in CC pg.156 that starts "For attacks with advantages... " and we make that special Active Point calculation for lets say an attack
with Base Cose 20 Points and with an Advantage(that modifies the way the victim takes damage) of +1/2, that equals 30 Active Points, and apply it to the above paragraph of "An attack’s DC is based on the number of Active Points in it divided by 5" we have no information on how the "Adding Damage" rules of CC.pg 157 apply to this CP/DC ratio, the information that is missing is that of HS6EV2 pg.97("Damage Classes of Advantaged Power") which is pretty crusial for game balance.