Hi, I know that RRC p24 Threat:
The Imperial player cannot have less than 0 or more than 20 threat. Any threat gained or lost beyond these limits is ignored.
Now assume you are playing a side mission at threat level 5 and the mission setup says "increase threat by twice threat level", so actually 10 threat and you have an optionial deployment. And the Rebells chooses to bring Chewbacca to the mission which gives you additional 15 threat and an optional deployment.
Is there a difference in the timing of these effects? Lets say you want to deploy some Troopers for 6 threat in one of the optional deployments. Do you subtract the 6 from 10 (or 15) ending up with 19 threat or must you first add 10+15=25 > 20, so you have 20 threat and end up with 14 threat after the opt. deployment?
Think it should be the first version, but the ruling sounds different unless there is a different timing, because the second version would effectively reduce the cost of Chewbacca by 5 to 10 which is only 2/3...