WL2 is crazy when remember it's not a legit AU but a composite feelings. To N25, if Kanade's happiness being fulfilled, she'd no longer be the same saviour who became the heart that saved & changed their lives. Her happiness is intrinsically exclusive to the happiness of others-
Subtextually, Kanade with her dad would still be under the grief from her mom's death. She compelled to step into a role of her replacement as her dad's emotional support & suppressing her pain in the process but for Kanade, it's all must rooted from the tragedy she set that day.