Leading up to the 49ers’ 15-14 win over the Chicago Bears on Sunday, we spent last week on a deep dive into Jimmy Garoppolo’s past. He’s been a quarterback for about 10 years now, after a move from outside linebacker during high school.



There’s a unifying thread in Garoppolo’s decade of education at quarterback: Tom Brady.



Throughout the whole process, Garoppolo’s personal quarterback coach has been Jeff Christensen, who knew the late Tom Martinez — the former College of San Mateo coach who mentored Brady.



That was a big reason why Christensen had Garoppolo watch film of Brady’s throwing motion on loop during the quarterback’s formative teenage years.



Then, the New England Patriots drafted Garoppolo, so he worked with Brady himself for over three seasons.



The result of all this exposure: Garoppolo’s mechanics now resemble Brady’s in many ways. In fact, it’s downright...