Quick Question!
1st question is 3 greens.
2nd question is purples equal to whatever stat you're using to oppose with.
Does the secondary skill have to have at least 1 rank in order for the upgrades to take place?
Yes...except it's not a "secondary skill". You have Attributes (Brawn, Willpower, Intellect, etc), and you have Skills (Coercion, etc). The highest number is the base pool, and they start as green (G). The lower number is how many of those greens are upgraded to yellows (Y).
Willpower 3, Coercion 0: GGG <-- highest number is 3, so base is 3 greens
Willpower 3, Coercion 2: YYG <-- highest number is 3, so base is 3 greens, upgraded twice to yellow
Willpower 3, Coercion 3: YYY <--number in the base pool and number of upgrades are the same, so all are yellow
Willpower 3, Coercion 4: YYYG <-- highest number is now 4, so base is 4 greens, with three upgrades.
If the you are using that pool as a difficulty pool for a PC to roll against, switch all the greens for purples (P), and all the yellows to red ( R ). So a PC trying to use Coercion on a Hutt, and the Hutt has Willpower 3 and Discipline 4, the PC will be rolling against RRRP.
Edited by whafrog