Maybe we should be being a bit more clear on this stuff.
All previous plans with Fused Irvine are kinda nixed.
In case it hasn't been obvious, we're building up to a confrontation between Cracken and Fused Irvine.
So "you" (by which I assume you mean one of your characters
) getting to kill Fused Irvine is not on the agenda, unless you can manage it without godmoding, which I doubt.