Brandon Belt is a free agent so won't be listed on the depth chart. It seems likely the Giants will make a QO. It seems like if he accepted it would be a good deal for both him and the Giants. They could also work out a 2-3 year contract at a lower AAV but his injury history is scary. That's the only think hold him back from very large multi-year deal.
MLB:
Wilmer Flores($3.5 M team option/$250 K buyout. Expect Giants to exercise option) Flores can play multiple positions. Giants could do worse than making him the RH side of a 1B platoon.
Darin Ruf(arbitration eligible, year 2. Projected arbitration award- $2.6 M). Ruf and Flores are similar players. Both kill LHP's and are decent against RHP's. After Belt got hurt, Ruf might have been the best hitter on the team! Seems like a no-brainer to tender him a contract.
Lamonte Wade Jr(Pre-arbitration; Options?). Wade Jr sure had a tremendous breakthrough season playing almost exclusively against RHP's. A couple of big holes in his swing emerged late in the season and postseason casting a cloud over how much the Giants can count on him for 2022.
AAA: No MLB caliber prospects. Jason Krizan played the most innings at 1B for the River Cats. I think he's a minor league FA.
AA: No MLB Caliber 1B prospects. David Villar played mostly 3B but most likely could move over to 1B.
A+:
Logan Wyatt- Lefty hitting 1B. OBP .386 but with a low BA and little power. Needs to hit for more power to be considered a serious MLB prospect at 1B.
Sean Roby- listed as 3B but played significant innings at 1B which is where his future probably lies. Hit just .241 but with 19 HR's. Future Value will increase significantly if NL adopts DH.
A: No MLB caliber 1B prospects in San Jose. Luis Toribio could move over from 3B in future. Toribio is another prospect whose future value increases if DH adopted.
Rookie:
Garrett Frechette(ACL)- Frechette is a major sleeper prospect for the Giants with a sweet swing. Hit .331 for his Arizona Complex League team.
Jacob Gonzalez(ACL)- Slashed .301/.360/.497 which is the right idea. He's just getting a bit long in the tooth for Rookie ball.
If Belt turns down the QO and the Giants can't work out a deal with him(personally I would not sign him for longer than 1 year), they will likely look on the free agent or trade market for a lefty hitting 1B. Anthony Rizzo, Kyle Schwarber or Yoshi Tsutsugo would be options.