The San Antonio Express-News (Travis E. Poling) reports:  Two more executives have left Spurs Sports & Entertainment, a month after the sudden departure of Executive Vice President Russ Bookbinder. The moves are part of an ongoing shake-up of the Spurs’ front office that could have more repercussions later this summer. Bruce Guthrie, Spurs vice president, and Paula Winslow, vice president of human resources, left the organization that includes the NBA franchise, the WNBA Silver Stars, hockey’s Rampage and the management of the AT&T Center.