First: I know what you're thinking, "There's nothing in the world that could make Rex Grossman improve...although he has a tremendous amount of room for it!"
But Grossman is finally in a role that suits him best—not on the field.
This isn't to say he is completely useless; he's not. What it means is that he can make a much greater impact to our team from the backup role.
If Grossman is anything, he is experienced. Having played in the league for what seems like ages and starting in a Super Bowl, the former Florida QB has the tenure needed to help show RGIII the ropes. He can help polish him in the film room, be a second set of eyes for him from the sideline and be an honest supporter.
Grossman knows that even if something catastrophic were to happen to RGIII injury-wise, Mike Shanahan likes Kirk Cousins and there's a chance that they may throw him in instead of Grossman.
From the team's perspective, Grossman can't do any real damage from the sidelines during a game. So that's a definite improvement.
But there's also the case of John Beck's 2011 offseason to consider here. Beck's popularity and mystique grew to a fever pitch last summer when he came out in the media, telling everyone he considered himself the starter.
The more he talked and the less he actually played on the field, the more and more people thought of him talent-wise. It wasn't until he actually started to play in real games that people immediately remembered how talentless he really was.
Next offseason, if Rex Grossman never plays a down this year but says all the right things and helps RGIII have a successful rookie campaign, I promise you there will be some team out there desperate enough at the quarterback position to give him another shot.
The league suffers from the recency error. However, if Grossman is called into limited action in 2012 and continues to stink it up, he may be on his last NFL contract.