KANSAS CITY, Mo. — Patrick Mahomes entered Arrowhead Stadium in style, wearing a puffy white coat, three shiny necklaces, black sunglasses, black pants and bigger-than-usual black sneakers. And he walked without a noticeable limp, a good sign that his truncated rehab this week to ease the pain in his right ankle was successful. Mahomes knew his mobility would be tested by the Houston Texans on Saturday afternoon. The moment arrived early, too,…