First, how he compares to the rest of the NFL is not relevant. It only matters how he compares to the guy that replaces him.
Allen has a 3.0 YPC despite facing nickel and dime defenses for most of his carries. Collins has 3.8 YPC despite facing 7 and 8 in the box on most of his runs. These are not small sample size anomalies. Collins has consistently been over a half yard better per carry than Allen on the Ravens.
I just went back and watched the highlights on nfl.com of the last three games. I only saw one play that went more than 12 yards with Allen on the field. All the rest of the long plays came with Collins opening up the field by causing the safeties to cheat up. This despite the fact that I think Aleen has out touched Collins on the year.
You don't think Collins has talent. You might be right. But the film shows that the defenses respect him a lot more than Allen, and that opens up the passing game.
So the choice is:
1. An offense that cant run at all and cant pass more than 12 yards, but protects the ball.
2. An offense that can both run and effectively throw deep, but coughs up the ball once every third game.
Second, Fitz being replaced by Winston is not a good example at all because he was the established back up only getting the start at the beginning of the season because of the suspension. Collins is the established starter getting benched twice for single mistake in games for a player the management thought was less talented. If you want a fair comp, you have to ask why Fitz was not benched for whoever the 3rd string QB was after his second pick vs Pitt.