by Calvin WatkinsFiled under: 49ers, Arizona Cardinals, Broncos, Browns, Buccaneers, Dolphins, Jets, Lions, Raiders, Vikings, NFL AnalysisWe're entering a dark period of the NFL life right now. Nothing is going on. Players and coaches are on vacation. With that we look at 10 quarterback situations worth looking at before training camps start in late July, because, well, it's always about the quarterback.1. Detroit. Matthew Stafford vs. Daunte Culpepper.The situation: It's the same...