INDIANAPOLIS — One of the Broncos’ most heated position battles of training camp was on display at Lucas Oil Stadium on Sunday. The quarterback competition may garner the biggest headlines, but the running backs have locked into a fierce struggle for playing time — and that came through loud and clear in the Broncos’ 34-30 victory over the Colts in their preseason opener. Second-year running back Jaleel McLaughlin’s investment in a JUGS machine proved beneficial when he caught a 22-yard pass from rookie quarterback Bo Nix on a wheel route.