Colorado has a deep pool of talent at running back, but to this point, it’s mainly been a one-man show. Sophomore Jarek Broussard has been exceptional, with 432 yards and three touchdowns and he ranks fourth nationally in yards per game (144.0). Broussard can become the first player in CU history to open a season with four straight 100-yard games when the Buffs (3-0, 2-0 Pac12) visit Arizona (0-3, 0-3) on Saturday in Tucson (5 p.m., TV: FS-1). It’s easy to see why the Buffs have relied on him. “You want to keep the hot guy going,” Buffs head coach Karl Dorrell said.