It looms as potentially the most important decision of what promises to be a busy summer in Stan Van Gundy's new job with the Detroit Pistons, and ownership is anxious to let him make it. One thing has rung true this spring as Pistons brass have discussed Greg Monroe's future with the team, whether formally or casually: It was imperative to hire a personnel man with the courage to make the potentially difficult decision on Monroe, one way or the other. Monroe, the Pistons' restricted free agent big man, spoke with Van Gundy shortly after the latter agreed Tuesday to become Detroit's head coach and president of basketball operations. Van Gundy's hiring formally was announced Wednesday. His introductory press conference is today. Van Gundy gave Monroe the coach-him-up talk, for quite possibly the first of many times the next four seasons. Prevailing league theory is that teams can't afford to let talented big men go without compensation, so if Monroe gets a maximum contract from another team, the Pistons may be forced to match. What Pistons brass wanted was a president of basketball operations who would make the correct decision on Monroe, not just one driven by that prevailing theory.