I appreciate the concept of going against the grain to gain new perspectives. And truth be told I agree that RBs are a little overrated compared to some other positions in all formats.
But I've got a couple of "beefs" with your stated approach.
First, what may work in redrafts doesn't necessarily apply to dynasty start-ups. There is (or should be) a HUGE difference in approach between the two. Having one dynasty startup under your belt (a couple of years from it) I don't think will bear the strategy out one way or the other. Dynasty lists are extremely difficult for any site or expert to present because there are so many variables that come into play. But the one thing that DOES differentiate them from redraft rankings is the fact that guys like Manning simply have less value. It's just a fact. Part of what makes QBs (and to some degree WRs) solid choices in dynasty startups is their longevity. But with guys like Manning, that longevity is already used up and is taken completely out of the equation (except for the other direction). You can't say "QBs last longer" and use it for a justification in taking a 35 year old guy over a 25 year old guy no matter WHAT position they play.
Which leads me to my second point. If you want to ignore a big part of what makes a dynasty ranking a dynasty ranking, that's fine. Totally fine to mix it up and present your own view of things. However, those rankings right now are so "out of whack" that they are skewing the overall rankings (of only 4 guys) in a significant way. I know I can turn them off and just look at the rest. But I don't want to have to do that. I WANT your opinion mixed in with the rest, I just want that opinion represented in a more realistic way. Right now I really can't do that because my personal belief is that "as is" some of them are quite frankly ridiculous if you look at them realistically. Do you know how far wrong you would have to be about ANY of those backs for them to be not worth a mid 1st round pick? I believe that they aren't AS predictable as some other positions, but Chris Johnson or Adrian Peterson, outside of some medical issue, are simply more valuable going forward than Peyton Manning is, and it's not close.
Again, I think I know and appreciate what you are trying to accomplish with the rankings. I'm just not sure it's the best approach to make the point. Folks aren't going to look at that Manning ranking and say "Wow, he's really out there, I wonder what drove him to that ranking?". They are going to say either "This guy doesn't know what he's talking about, I'm going to remove him." or "There must be some kind of technical problem, I'm going to remove him." Neither accomplishes your mission.
Just my opinion of course.