I agree with with your post - except on 2 points:
1. Zook recruited C. Jackson but Meyer still coached him for his final season at UF - that is plenty of time to get to know one of your "star" players and give enough advice to a close friend of whether he should be traded up for in the draft.
2. Everyone who uses the "no one saw murder on the horizon for AHern" argument is correct to some degree…but the bottom line is, AHern fell almost 2 and half rounds in the draft based on off-field questions that teams were not comfortable with. That IS the red flag. No one saw the murder coming - but there were plenty of data points, rumors, "dropped charges," etc that made AHern a very high risk investment. The guy loved guns…somehow he was able to get into fights, shoot people, and probably even carry weapons all this time but NO ONE seemed to know. Regardless, SOMETHING kept him off certain draft boards and kept other teams away. One can argue the Patriots had the MOST intel on AHern based on the close relationship with UF and Meyer. Drafting him is one thing, but then giving him the King's Ransom (my NEP standards) BEFORE he has even played out his first contract is the larger, less forgivable error.
Obviously, this is all hindsight…and I was a huge AHern fan who still can't believe these events. And still in a sick, absurd way, I hope he is some how going to be able to get his life back.