By Alek Arend On Thursday, 49ers legend Joe Montana had troubling information on rookie QB Trey Lance to pass along. In an interview with our own Andrew McCarty of The Spun, Montana shared what he’s heard about Lance as of late. In short, Montana is worried Lance isn’t ready for the spotlight. In fact, the all-time great would keep Jimmy Garoppolo if he was in charge of the team. “I don’t think he’s ready,” Montana said of Lance. “And that’s just what I hear. I heard even more things today from some of the players, so I just don’t think they think he’s ready. But if they’re willing to get rid …