Had this come up last night, Shooting with the Party Bus at Fenn Rau, and wasn’t quite sure what happens when.
The concord Dawn title states:
When defending, if you are inside the attacker's firing arc and at Range 1, and the attacker is inside your firing arc, add 1 Evade result.
Now as far as I am aware adding a dice is considered modifying the die results, but at the same time it seems to me that you add the result when you roll the dice and at that point could be altered by Zuckuss.
I'm 99% sure that regardless of when the added die result happens Omega Leader shuts it down, but I'm just not certain on the Zuckuss interaction. I'm leaning toward the evade result being added just after you roll the dice as there is a lot of similarities with C-3PO, but as the wording is not exactly the same there's more than enough doubt for both options to be the answer. As I asked in the main Forum our countries nationals event is next weekend and no FAQ is in sight so hoping to get some direction of this issue.