Lol. What's moronic is this post. You honestly think that team wins their last 4 regular season games had they made that switch?
Remember the context. (I don't necessarily agree), but the team felt they were robbed of the Minnesota game. During the week after the Minnesota game the announcement to let Brian go was also made. These factors combined to create a team that was hungry to prove that they were good enough. Not by switching QB's. But hungry to prove that what they already were was good enough. They had to do this by doubling down on who they were, fighting for each other, and pulling together as a unit. And the team did just that to the tune of 4 straight wins.
Backup QB's aren't going to be given any priority during a season. Now, during the spring, is when a staff will focus on Marco's development.
And the weak point you're trying to make is even less applicable with a new system being installed. More reps for Marco last season wouldn't have necessarily put his development in the new system much further along