Why are the Giants changing all the coaches?

The Giants continued their game of Musical Coaching Chairs yesterday, with former hitting coach Hensley Meulens officially moving to bench coach, former bench coach Ron Wotus moving to third base coach, and former third base coach Phil Nevin moving to the list of guys you’ll someday miss on a Sporcle quiz about Giants coaches. With Dave Righetti, Mark Gardner, and Steve Decker being kicked upstairs, it’s a total revamp of the coaching staff, which is unprecedented in Bruce Bochy’s tenure as manager.

On the one hand, this may seem like a natural move after such a disastrous season. On the other, what can it really accomplish when the core of the team, which failed spectacularly all year,…