I agree with Windy.
If we upgrade the line, it will make a huge difference in the outcomes on the offensive side of the ball. Massie, Long, Leno, and the parade of backups is not going to work. If we invest capital into the line, then it will make Mitch better overnight.
With that said, I wanted to take a moment to highlight that Mitch is the most accurate Bears QB with a minimum of 16 games started. At this juncture, we can say that Mitch is on a similar trajectory to Cutler in terms of impact. Where Jay had the arm, Mitch has the legs and we should probably take advantage of Mitch's ability to move around. Improving the line will even make this option even more viable.
Looking at the board and looking at the options, we do not have a choice but to double down on Mitch. We don't have enough draft capital to get a better QB and the FA market is terrible. Free Agents do not win Super Bowls unless they are GOATs (like Brees and Manning).