The Charlotte Bobcats: Where comeback attempts happen.Antoine Walker hasn’t had a job in the NBA for nearly 21 months. He doesn’t have a known invite to an NBA training camp, either, with just two weeks to go before most teams are scheduled to assemble for Practice No. 1 of the new season. But Walker does have a former college teammate and very close friend that plays for the Charlotte Bobcats, whose new owner isn’t just a living legend but another longtime Walker pal. So it certainly made some sense when word reached Stein Line HQ on Sunday night that Toine is expected to arrive in Charlotte this week to stay with Bobcats center Nazr Mohammed, his buddy and fellow Kentucky Wildcat, and join in daily pickup games at the Bobcats’ facility leading up to the start of camp on Sept. 28.