By Jeremy Woo A huge second half vs. Miami was a reminder that the Jayhawks are the highest seed still standing. CHICAGO — The lifespan of a top seed tends to follow the same basic pathway: everyone’s a heavy favorite until somebody goes down. When that first domino falls, suddenly, nobody’s safe. And in a single elimination tournament like this, each shaky moment from one top dog reinforces that someone else might be next. All of a sudden, everyone’s vulnerable, and Baylor, Gonzaga and Arizona all hit that wall this March. The Kansas Jayhawks, the last No. 1 standing, went into Sunday’s halft…