On the first day of fans attending training camp, the Denver Broncos had a slight surprise with their top running back. While it’s still very early, J.K. Dobbins, not RJ Harvey, was the Broncos’ No. 1 running back. Head coach Sean Payton called the Dobbins signing “important” earlier this week and touched on the running back dynamic after Friday’s practice, and how he’s more of a known quantity at this stage. “We have a little bit more at this level on J.K. I’m anxious to see the whole group,” Payton said.