By saying "Distributed" do you mean the 6509 line modules will run with the DFC? You don't have DFCs in scenario A.
Also, if you have a 6509 and are using a Sup2 and SFM, you might want to look at the Sup720. It's not much more than the Sup2+SFM and included the SFM functionality onboard and save you a slot. The only thing is, if you use the Sup720, you have to use the DFC3 card if you want to take advantage of the DFC technology which adds some to the cost.
I'd also think about 2500 watt power supplies for use with the sup2 and 4000 watt power supplies for use with the sup720.
DFC is for accelearting packet perfomanc but not to avoid single point failure against MSFC or RP failure. Correct match for DFC is Distribute packet perfoamnce daughter board, please note it is useless without a master like MSFC2/PFC2..PFC2 pushes master FIB (CEF Forwarding Information Base) to DFCs in line cards.
Please refer to best practices for Gigabit ethernet networks on CCO.
If your customer wants to avoid single point failure(I assume it is core switch)....Consider using 2 chassis with single Sup/MSFC,SFM and PS or a sinlge chassis with redundant Sup/MSFC,PS and SFM.
Please note DFC cant avoid single point failure. It is just a packet forwardig accelerator.
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