EL SEGUNDO >> The conflicting emotions swirled around Luke Walton’s head as he tried to process feeling both a “little sad” and “excited.” The Lakers’ coach expressed sympathy over Lakers president Jeanie Buss firing former general manager Mitch Kupchak and demoting her brother, the former executive Jim Buss. Walton also conceded initially wondering why Jeanie Buss made the moves before Thursday’s trade deadline.