CHICAGO — The Chicago Sky will never know what could have been with a team built around Kahleah Copper. For the past year, the Sky’s sole focus has been building a team for the star who stayed. But on Tuesday, both sides gave up on that effort as Copper was traded to the Phoenix Mercury. In many ways, this trade is the logical first step in a rebuild that became a necessity after last year’s free-agency implosion. The payoff is appropriate: The No. 3 pick in 2024, two second-rounders in 2025, another first-rounder in 2026, plus two frontcourt additions who can make a meaningful impact during t…
