When the New England Patriots lost Khyiris Tonga in free agency to the Kansas City Chiefs, the attention at the defensive tackle turned to the NFL Draft. But seven rounds came and went and the defending AFC champs didn't select a single one. So while the lack of drafting a possible difference maker in the middle of the defensive line could be questionable, the team eventually signed one in undrafted free agency . Miami's David Blay -- who was part of a stacked defensive line unit for the Hurricanes during their run to the national title game -- reportedly signed a deal with the Patriots, the only new defensive tackle that is now on the active roster after this weekend. Right now, defensive tackle is a stacked part of the roster. Milton Williams and Christian Barmore are sitting on the positional throne, while Leonard Taylor III, Cory Durden, Joshua Farmer and Eric Gregory played roles las season. For Blay, he has the talent to impress during training camp practices.…