That was my point...actually...
It's like this. When you have 2 backs equally talented, you get to run the 2-back approach like we did with R&R. The primary benefit of this is CONSISTENCY...for all the reasons I talked about in the article. When one goes cold, chances are the other isn't cold.
But when you have 2 backs and the talent is not equal, you do not run the 2-back approach because all you're doing is taking away carries of the primary RB, and replacing them with inferior carries of the secondary RB. This has the overall effect of limiting the upside WAY more than the downside...because if on any given sunday Ronnie has only a 30% chance of having a bad day, while Sammy Morris has a 50% chance or 60% change of it, then combining their productions means a whole lot more totally cold days than it would if you were combining Ronnie (30%) with Ricky (30%). With Ronnie and Ricky you get like only a 9% chance of a completely cold day. With Ronnie and Sammy, the chance is double that. And then on the upside, let's say that on 50% of days Ronnie is going to have a good day, same with Ricky, but Sammy only 20%...then with Ricky & Ronnie you're going to get a great combined day 25% of the time but with Ronnie and Sammy you're going to get one only 10% of the time.
So basically at that point, why even share their fortunes? Might as well just have Ronnie handle it all, give you a freaking fantastic day 50% of the time, a mediocre day 20% of the time, and a bad day 30% of the time. With unequal talents, a shared system results in limited upside without much downside limiting to outweigh it.