I'm basing it on his complete lack of exposure to top football talent for the past 8 years, the fact that he's a new head coach and working for an organization that has made it clear the GM will make personnel decisions while the coach will coach. Trestman will make decisions about the final roster when it's time to cut guys, but Emery will be the one bringing in the talent. There have been a ton of head coaches in the NFL who came in without exposure to top football talent for long periods of time. To assume that they won't be heavily involved in personnel doesn't make a whole lot of sense. Emery said that he will make the final personnel decisions. No [expletive], he's the GM. But he also said that he's going to use a hybrid model of coaching staff grades, scouting grades, and 3rd party stats when making decisions. Trestman will be involved.