LAS VEGAS — Headed into Super Bowl LVIII, Marquez Valdes-Scantling believes the Chiefs are battle-tested. The Kansas City Chiefs receiver was at the center of a turbulent midseason stretch that started with a costly fourth-quarter drop in the Eagles’ 21-17 win at Arrowhead Stadium in Week 11. The Chiefs lost three of their next five games, with miscues from a much-maligned wide-receiving corps at the root of their problems. Fittingly, Valdes-Scantling was central to the team’s deliverance a few months later, sealing the AFC championship late in the fourth quarter with a 32-yard catch against t…
