ARLINGTON, Texas — By the end, they were all holding on, wishing for more time, wondering how it had all ended like this. Jeff Withey, Kansas’ senior center, sat on the side of the Jayhawks’ locker room on Friday night at Cowboys Stadium, the area a distraught mix of sadness, frustration and despair. In the past hour, it had all unfolded. A stunning collapse to Michigan. An 87-85 overtime loss. A 2-minute, 52-second stretch that will linger in infamy, the latest NCAA Tournament disappointment for top-seeded Kansas.