'Knowlt said:
Simple supply and demand, along with the fact that the drop off between startable RB and the scrap heap is much greater than the same drop at the WR position. Without a flex spot, 12 teams are fighting over maybe 18-20 legitimate starter to plug in at RB to fill 24 starting spots. Now with the flex, 12 teams are fighting over the same 18-20 starters to fill up to 36 starting spots.So, in short, yes the flex adds some value to the RB position, but only to a certain point. Obviously you will be at an advantage if you can grab 3 of the top 20 or so RBs and plug them in. Realistically, that can't happen for all 12 teams, so that is where the knowledge of where that break point between RB and WR value for the flex starting spot comes into play.

This is a good overview of why a flex position that allows RB/WR/TE inflates RB value. More owners will want to draft the meager supply of "featured" running backs or lead backs in a committee if there is a chance of starting three RBs each week. While the elite wide receivers are still more valuable than lead backs in a committee, they become less valuable in relation to the few "featured" backs in the NFL, so you see almost exclusively RBs in the first round of this sort of league (with the possible exception of Andre Johnson and Roddy White this year)These are the guys I'd call "featured" backs (please note this isn't the order I'd rank their probable 2011 finish in total fantasy points - but these guys are likely to see 60+% of the total touches available out of their respective backfields):Charles, Jamaal - KCRice, Ray - BALPeterson, Adrian - MINFoster, Arian - HOUJohnson, Chris - TENMendenhall, Rashard - PITTurner, Michael - ATLMcCoy, LeSean - PHIHillis, Peyton - CLEJones-Drew, Maurice - JAXMcFadden, Darren - OAKGore, Frank - SFJackson, Steven - STLBest, Jahvid - DETAddai, Joseph - INDBenson, Cedric - CINThese are the guys I'd call "lead backs in their committees" - likely to see greater than 50% of the total touches out of their respective backfields.Bradshaw, Ahmad - NYGWilliams, DeAngelo - CARGreene, Shonn - NYJBlount, LeGarrette - TBGrant, Ryan - GBJackson, Fred - BUFForte, Matt - CHIHightower, Tim - WASIngram, Mark - NOMcGahee, Willis - DENSo there are ~26 guys currently playing in the NFL that I'd want slotted between RB#1 and RB#3 for my team in a start-2RB + 1 flex (RB/WR/TE) scenario as of the second week of preseason. Some other guys may fulfill their potential (Ryan Williams, Ryan Mathews, Daniel Thomas) and join the above list by the end of training camp. Some of those 26 guys on my rough list will suffer season-ending injuries, or lose enough playing time to an up-and-coming challenger, and drop off that list. Probably a few veterans I didn't name will move up in there, too. But the bottom line is IMO 25ish or so backs are likely to be worth picking for the 36 available starting RB slots in a 2 RB + 1 flex (RB/WR/TE) league. That's why the demand for those 25ish guys at RB is more pronounced in a 2 RB + 1 flex (RB/WR/TE) league than a traditional start 2 RB league. 4 more weeks to real

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