Matt Maiocco’s 53-man roster projection after 49ers’ preseason game vs. Broncos

The 49ers’ preseason opener was all about the bottom of the team’s roster.Coach Kyle Shanahan opted to play it safe with the team’s regulars after many of the veteran mainstays got in a lot of work in a joint practice with the Denver Broncos on Thursday in Santa Clara.There were 33 players who did not suit up for the 49ers on Saturday night in San Franciso’s 30-9 loss to the Broncos. Only three projected Week 1 starters — left guard Ben Bartch, linebacker Dee Winters and safety Jason Pinnock — took the field for the preseason game at Levi’s Stadium.NFL teams must trim their rosters to the regular-season limit of 53 by Aug. 26. There is still a lot for the 49ers to sort out, but here is one opinion of how things look right now:Quarterback (2)Brock PurdyMac Jones*Non-football injury — Kurtis Rourke (knee)Overview: Yes, the three-QB rule was put into place because of the NFC Championship Game debacle when  Purdy and backup Josh Johnson were injured. But there are only two QBs on this team worthy of spots on the 53-man roster. The 49ers could bring...