Harry Potter had many possibilities open to him, so did the other characters. Draco learns about the old Norse proverb: "Bare is back, without Brother behind it." And after all, Lucius had originally wanted Draco at a school other than Hogwarts.
Beginnings are delicate things; suppose Lucius Malfoy had been a little short of money...
Hermione gets some of the answers early. She has trouble understanding what all the questions are.
The TriWizard Tournament was a year-long plot by Voldemort's minions. Something that long and complicated with so many parts all having to mesh perfectly had many occasions when something could have gone wrong. Especially as some of the actions of the false Moody required experimental spells, never before attempted. Some minor glitches could have brought disaster for the villains.
Remus Lupin didn't graduate from Hogwarts to become an odd-jobs man. He always knew he would be fighting the good fight, he just didn't know on which side of the Law. In the end,he made his own side.
Any suffienctly advanced science would be thought of as magic"-Arthur C. Clark. "We are being present at the birth of the Superman!"-Frederick Nietzche. AU/OC.
A sort of a love story.