I have no interest in getting between you and your arguments, but that comment above shows a total lack of awareness. Every coach in every American professional league is intimately involved in personnel and player evaluation. Conversations between a coach and a GM are on-going year-round. Conversations between coach, GM and scouting staff are continuous. Once the season ends, coaches spend all their energy evaluating talent in person, on film and in interviews.
This role of a head coach is heightened in the NFL and the NBA, where coaches are de facto asst. GMs, whose opinions carry great weight on draft picks, free agent acquisitions and trades. In many situations, a coach's opinion is the primary opinion, which is what we saw early in the D'Antoni era.