Charlotte Bobcats rookie Michael Kidd-Gilchrist has a perma-smile, so you judge his mood by the width of his grin. Asked about ex-Kentucky teammate Anthony Davis Thursday, Kidd-Gilchrist all but glowed. “My best, best friend,’’ MKG said. “He’s my brother. So close.’’ These two seem inseparable. First they led the Wildcats to the national championship. Then they went first and second in June’s NBA draft, the first pair of college teammates to go 1-2 in NBA history. So it felt appropriate they should face off in back-to-back exhibitions at the start of their rookie seasons. Davis’New Orleans Hornets won a home game Tuesday night. The rematch was Thursday at North Charleston Coliseum.