Despite rampant speculation during the offseason surrounding a potential trade that would send Eagles tight end Zach Ertz to the Buffalo Bills, Dawson Knox kept his head down and kept working. And four games into the 2021 NFL season, Knox is proving why the Bills not only opted against acquiring a tight end during the offseason, but placed complete faith in the 24-year old they drafted in the third round of the 2019 NFL draft. In a wet, rainy game at Highmark Stadium against the Houston Texans, Knox caught five passes for 37 yards and scored two touchdowns, helping propel Buffalo to a dominant 40-0 victory. With four contests in the books, Knox has been everything the Bills hoped he’d develop into – an athletic pass-catcher with reliable hands that has the speed to get past defenders, with the power and physicality to break tackles and pick up extra chunks of yards. He’s been a key cog in Buffalo’s offense, catching 15 passes for 144 yards. His four touchdowns are tied with Rob Gronkowski for most in the NFL through four weeks. The Bills believed in Knox’s ability to have this type of impact all along, but it’s been an up-and-down…