Niyo: Getting Lions' offense in gear will be work in progress

Allen Park — School’s out for summer, but class is in session as the Lions officially begin training camp today.

And with attendance no longer a worry — the arrival of Darius Slay and Damon Harrison this week quelled any concerns about a high-profile holdout — the attention shifts back to where it usually rests with this team. Or just about any NFL team, really.

Lions quarterback Matthew Stafford will be working with his third offensive coordinator, this time Darrell Bevell, in the last five years.All eyes will be on the quarterback, Matthew Stafford, who begins his second decade in the league with an all-too-familiar challenge. He’s trying to figure out how to turn this franchise into a…