Bulluck, who played under Schwartz during his spell in charge of the Titans defense, told the Lions' website: "We had talent in Tennessee with our defense when Schwartz first became our coordinator, but it had to be re-cultivated. It was the same thing with Detroit. They drafted talent but it had to be cultivated.
"He's definitely a guy that's going to make sure you have the information. He's a smart coach. What that translates into is him being smart enough to understand his players, realise the talent he has and put them in the best position to be successful, or to get coaches that can get through to those players and understand where they need to be within a defense."
Schwartz spent 10 seasons with the Titans before moving to the Lions in 2009.