Broncos placed C J.D. Walton (ankle surgery) on the active/PUP list. He'll go on reserve/PUP at final cuts. Walton underwent a second surgery on his troublesome ankle in June. The Broncos are hopeful he'll be able to play in the season's second half "if all goes well with healing." Nick Koppen will be Denver's starter in Week 1. Walton is in the last year of his contract.