Troy Franklin had a routine before training camp practices. The rookie wide receiver would line up on the end line of the Broncos’ practice fields and work on his releases. Not fancy stuff, just getting off the line efficiently and cleanly. Most days, passing game coordinator John Morton would remind him — sometimes calmly, sometimes more animated — to work on a detail so small you’d never notice it during a game. In a way, though, it encapsulated the entire challenge in front of Franklin this summer.