The point, I think, was that blaming RW's struggles on his rookie QB status would be more convincing if there were any rookie QB playing worse than RW.
Brandon Weeden? There is more to a Qb than simple passing yards, especially desperation yards near the end of games.
Yes, there is.
Have you watched Weeden play? He's gotten better each week, though I really don't think he'll be that good in the end.
RW, on the other hand, has regressed. As defenses realize he does not have the ability to throw short passes or step up into the pocket, he becomes easier to defend.
Weeden, Tannehill, RG3, and Luck are showing the ability to do new things each week, which makes them less predictable, and provides hope that they are going to get better.