At Notre Dame, running back Audric Estime was fearsome. Playing with power and strength, exemplified by his Hulk-like arms, Estime was wrecking a ball, mowing down or even leaping over tacklers that stood in his way. Even with shorts and a practice jersey during the Broncos’ rookie minicamp on Saturday afternoon, the fifth-round pick still looked like an imposing figure that someone wouldn’t want to get in front of when he’s moving at full speed. The addition of Estime and undrafted rookie free agent Blake Watson has created an interesting competition within Denver’s running back room that will be closely monitored throughout the team’s offseason program and training camp.