Why trust Nagy though? Nagy is wedded to a system that hasn't proven itself to work with either Trubisky or Foles. This entire, "we need to draft or sign this-or-that QB for the system" stuff needs to stop because Nagy doesn't even have the cred to force his "system". In the perfect world, Bears would draft QBs using the "best player available" mentality and then BUILD the system around them like Baltimore did with Lamar Jackson who they got with the 32nd pick which also refutes the claim that you need a top 10 pick to get a star QB. The best QB of all time (Tom Brady) didnt even go first round, the guy we tried to trade for Russell Wilson, didn't either.
This is what got them in trouble with Trubisky, Pace wanted another Drew Brees clone so bad that he never considered how unique Mahomes/Watson could be. Also Mac Jones was surrounded by elite talent at Alabama and was throwing to nothing but studs, in my opinion guys like him have their stock go up and Justin Fields have their's go down because of a disparity in game tape. Mac Jones has less than 20 games, how much tape is there on him? This is what benefited Mitch in the draft, he had so much fewer games than Mahomes/Watson that his flawed were masked and Mahomes/Watson got over criticized simply because we had 30+ games to evaluate them from. Jones is another one of these sub 20 start QBs who we dont know how GOOD he really is. And if the Bears wanted someone for a predetermined "system", they actually need mobility at QB more than anything.