By ARNIE STAPLETON ENGLEWOOD, Colo. — Even without Bo Nix, the Denver Broncos are radiating plenty of swagger heading into the frigid AFC championship game against the New England Patriots behind backup quarterback Jarrett Stidham. “No, I don’t think the vibe’s any different,” right tackle Mike McGlinchey said after a Jan. 23 workout, part of which was outdoors in 20-degree temperatures and icy wind. “Obviously, it was a tough situation. You don’t want to see a guy that’s your leader and the life of your team go down, especially in such a big moment. “But Stiddy’s done an unbelievable job this week stepping in and commanding the huddle, commanding the team. He’s ready...