After running primarily with the No. 2 defense leading up to the Dolphins game, Amos spent the final two practices in Bourbonnais taking starters reps at safety alongside veteran Antrel Rolle.
"We thought enough of Amos to draft him," Fox said. "I think he's had opportunities just like all the other safeties to play and be evaluated and make plays. He's earned where he is. I don't know if that's the way it'll stay. It's not where you start the race it's where you finish it. He's earned that and we'll go from there. "
Some questioned Amos' physicality coming out of Penn State, but the rookie mixed it up on Sunday, shoving tight end Dante Rosario to the ground near the sideline in a team drill. Rosario was not pleased and slammed his helmet to the ground in protest.
"I checked him [Amos] out and he seems like a physical player," Bears receiver Eddie Royal said. "He looks like a guy that will get in there and compete and a guy who wants to play. He's a great addition to our team. I think he's going to make a lot of plays for us."