While one 49ers beat writer believes Jimmy Garoppolo is good enough to be a starting quarterback in the NFL, he doesn’t know how that happens this year. As the NFL preseason nears, speculation about San Francisco 49ers quarterback Jimmy Garoppolo’s future continues. On Tuesday, NBC Sports Bay Area 49ers beat writer Matt Maiocco stopped by KNBR to talk Niners and was asked where he saw Garoppolo ending up this season. Despite Maiocco’s years of experience, even he seemed unsure of where the longtime 49ers starter would end up. Maiocco reiterated what many others around the league have suggested: the least…