On the doorstep of history, Valarie Allman can throw herself into uncharted territory in Paris. The Silver Creek High School graduate and defending Olympic gold medalist is back at the Summer Games, where the world’s top-ranked thrower is a favorite to return to the top of the podium. If she triumphs, she’ll become the first American woman to win two discus golds. That would add to an already unparalleled resume — one that includes the top 13 marks ever thrown by an American woman (and 36 of the top 40) as the only American woman to medal at multiple World Athletics Championships. “Valarie has been incredibly consistent over the past four seasons,” said her coach, Zebulon Sion.