I get what you're saying and I've heard that as the reason why Jake shouldn't get a shot, but there are plenty of examples of the guy on the bench being better.
Kid out of Michigan named Tom Brady ended up being pretty good.
Everyone thought Saban was crazy when he put Tua in over Hurts, but Tua ended up setting CFB records. Joe Burrow literally had the best season ever and had to transfer out of Ohio State to get PT.
Yes, I understand thinking the backup can do better when the starter is struggling is a common theme, but feels a little disingenuous when Jake got here he was the best QB prospect we'd landed in a long time, he was neck and neck with TVD until he got hurt and TVD won by default, and he seems to be more confident and in himself and comfortable leading the team on the field.
I feel bad that TVD might not be the guy because I think he's a good dude and a fierce competitor, but Garcia seems ready for the moment and I think he deserves a shot if Tyler can't figure things out.