The late addition of well-respected former
Castillo joined the staff as a consultant Monday and will go forward next season with the title of run-game coordinator.
Castillo worked previously with Harbaugh in Philadelphia on former Eagles coach
Harbaugh indicated that Castillo had job offers from multiple
"Juan is a tremendous football coach," Harbaugh said. "He had lots of opportunities. He has been coaching in the NFL for a long time, both sides of the ball, obviously with a lot of responsibility. Highly knowledgeable, a great teacher, I had a chance to work with him for 10 years in Philadelphia.
"So, I know this man very well, know his family. He's a very good person. And it's an opportunity for us to improve our football team, the overall talent pool that we have here. We add him into our staff, which already is just a great staff. It makes us better, and that's the whole idea. ... He had lots of opportunities. And he chose to come here."
As a run-game coordinator, Castillo is expected to provide guidance to running backs coach Wilbert Montgomery and offensive line coach Andy Moeller while working in conjunction with offensive coordinator
"He'll be a lead coach in terms of the run game and organizing the run game for us," Harbaugh said. "Of course, he'll work closely with Jim and all the coaches. Who's in charge of what? Guys work together on a staff. Coach Caldwell has done a great job of making that point time and time again."