A generalization isn't a "personal opinion"
It's turns into personal opinion if I'm the only one who made a connection on the generalization

She got hit by the evil energy whatever in 4. Boom, it makes sense now, they really did set it up as much as they could, even though they could completely ignore that if they change their mind about wanting a Dark Sakura. I guess she could still be comic relief.
Eh, I remember seeing that ending, and after seeing it again, it doesn't really seem like any substantial "evil energy" really nailed her in that. Her ending never stood out to me then, and it still doesn't....not many of them did though in 4.