Nothing’s guaranteed for a top CB prospect without a great defensive coach bringing his skill or performance to the next level through the scheme or coverage technique. Lattimore was expected to be an immediate good starter who should hold down one of the CB spots for a long time. DA’s tutelage helped him become a top 5 elite corner.
For every elite top 10-20 CB pick who looks like they should dominate from day 1, there’s a top 10-20 bust/average CB who flames out of the league or becomes a journeyman depth CB in 5 years. There’s Jeff Okudah (3rd overall), CJ Henderson (9th overall), Kevin Johnson, Hargreaves, and Arnette busting from the top 10-20 just as much as there’s a Lattimore, Ward, Sauce or Jaire.