I tried this last year. Ended up with Deuce, DDavis, and Quentin. Long story short, I had one great week, then the whole thing imploded. Deuce went down, Quentin lost his job, Davis had injuries. I think the plus side of this strategy is that three solid RBs is a terrific foundation for a team. The downside is that if you put all your eggs in one postitional basket, you can't rely on other positions to carry you if guys at that position don't work out.
Would I do it again? Not sure. But I'd much rather end up with Deuce, DDavis, and Javon Walker than Deuce, DDavis and Tatum "This Year's Quentin" Bell.