ENGLEWOOD, Colo. (AP) — Peyton Manning is discovering that one of the biggest benefits to joining the Denver Broncos is their star-studded secondary.

It’s helping him gauge his progress in his comeback, sharpen his timing with his new targets and scrape away the rust after his lost 2011 season.

The Broncos restocked their defensive backfield over the winter after seeing Pittsburgh’s four-wide receiver sets and New England’s big tight ends torch them in the playoffs.

They added veterans Tracy Porter, Drayton Florence and Mike Adams along with rookie Omar Bolden, released Andre’ Goodman and wished Brian Dawkins well in his retirement.

With Quinton Carter sidelined, fellow second-year safety Raheem Moore is turning heads again, as is second-year cornerback Chris Harris, who will prove hard to bump out of his nickel back spot.