Definitely helps, thanks!
What I think I'll do with the iso, is target a certain amount of growth per week.Basically just slow down the spending to only the most important places, so that over time, the level is trending higher.
After reading more about BRB-Carnage, pulling for them sounds really good. I'm a bit torn on the 5FH though.
I already use Kitty a fair amount, meaning that I'd get immediate benefits from that 5th yellow, even without champing her.
But since I already know I don't have the resources to complete BRB, that might be the safer long-term strategy. It's an extra guaranteed cover for him from these pulls, and Kitty is close enough to finish by other means.
I'm leaning towards splitting the difference, picking up some Kitty first to increase the means of finishing her, and then switch to Bill to get "most of a cover". There should be more shard options to build on in upcoming events.