KANSAS CITY, Mo. — Jet skiing with his two younger brothers last December in Hillsborough Bay, Fla., Blaine Gabbert heard what he recalled a day later as a vague and “faint noise” in the distance. Turning that way, he saw what initially looked like a crew boat that had broken up into several pieces and what appeared to be two yellow life jackets. “It was kind of surreal,” said Gabbert, the…