The IC Critical Flaw is something that reduces the IC's impact on the MC (toward Change). How is the IC's belief that the MC can avoid killing him something that reduces his impact? To me, it seems like a strong part of his influence on the MC -- closer to the Unique Ability than the Critical Flaw.
I really think you should let Dramatica pick the IC Critical Flaw for you, based on other choices you make, rather than assign it yourself*. You might be surprised what it ends up being.
Also note the IC Critical Flaw doesn't have to be attributed directly to the IC. In Pitch Perfect the IC Critical Flaw of
Denial is MC Becca's repeated rejection of Jesse (the IC), which she kind of falls back on anytime he challenges her.
* Maybe you're trying to use this to pick between two storyforms? Trying to distinguish between Hope and Dream for such an esoteric story point is tricky, but do consider that it might be MC Luke's hopes or dreams (or lack of hope, or nightmares, etc.), that insulate him from the IC's influence.