No of
No offense, but you’re guessing about those other things too. My son has had the flu both with and without having the vaccine. His symptoms were quite alike.
And my dad died after getting his vaccine. Had it 8 straight years, never had the flu, and then died. So yeah, please don’t act like it’s a certainty that everyone who gets it was exposed previously. He got sick the very next day. If you’d add “most,” “usually,” or “scientists think,” I could agree with anything you said. But science is just conclusions drawn from data, and there are cases outside of the norm. But based on numbers of samples, that can still mean quite a lot of individuals. I’m a scientist too; they know this stuff isn’t 100%, so we shouldn’t think it is.