Brock Osweiler opportunistic about chance to practice with first-team

  With Gary Kubiak in charge, everyone gets to play. And everyone has to sit. That includes sure-fire Hall of Famer Peyton Manning. On Monday, the Denver Broncos’ fourth practice of their 2015 training camp, Manning watched from the sidelines as fourth-year quarterback Brock Osweiler took the old man’s reps with the first-team. Unsurprisingly, Osweiler struggled early while running the…