There were plenty of explanations offered, first by Seahawks coach Pete Carroll, then by offensive coordinator Darren Bevell and quarterback Russell Wilson, but at the end of Super Bowl XLIX, with everyone left breathless, the question still hanging out there along with the confetti falling on the victorious Patriots: How in the world does Marshawn Lynch, as fearsome a runner as there is, not get the ball on second down from the New England 1-yard line in the final seconds? “We had it,’’ Seahawks linebacker Bruce Irvin said. “I don’t know how you don’t give it to the best back...