For the past six months, Broncos special-teams coordinator Tom McMahon has admitted — repeatedly, almost monthly — that his group needs to improve in all facets.



He said it in January when he was the lone coordinator retained as part of Vic Fangio’s new staff. Mentioned it again in April, ahead of the NFL Draft. And again in May, and again throughout training camp.



“Every single area we have to improve on,” he said. “I think the players would agree. Whether you’ve had success or you struggled in a different area, the next day is the most important thing. What happened yesterday is going to eat you in the grave, but we have a long ways to go.”



When the Broncos opened training camp in late July, perhaps no position had a more open competition than returner. Other spots needed reserves, the quarterbacks needed a clear No. 2, but no spot needed an entirely new group to come into form.



Now, with the Broncos...