Lakers owner Jeanie Buss recently gave Magic Johnson permission to fire coach Luke Walton at the conclusion of this season after being informed of Walton's unwillingness to "bulk up" his coaching staff, league sources told Yahoo Sports. Johnson, who held an impromptu news conference outside the Lakers' locker room Tuesday to announce his resignation as president before the team's final game of the season against the Portland Trail Blazers, had been displeased with Walton's ability to effectively make in-game adjustments and he felt the coaching staff lacked the experience and expertise to foster player development, sources said. Young Lakers castoffs D'Angelo Russell and Julius Randle put together career years with the Brooklyn Nets and New Orleans Pelicans, respectively, which led to Johnson questioning Walton's coaching staff, sources said.