I recently read an article that stated that there were indeed multiple DPRs. The argument was based upon the fact that an agent instrumental in the Silk Road investigation had testified in court that their original suspect was Mark Karpeles, and that he had allegedly paid off LE to leave his ass alone in the case. Apparently someone else had testified that there were without a doubt, and there is also the strange fact that someone used the DPR account while Ross was in prison.
If this is the case, then I'm going to speculate about who the other (s) might have been.
Let me start off by saying that I believe Ross was the original creator of SR.
I think two people who definitely could have been DPR are Mark Karpeles (like LE originally thought) and whoever Satoshi Nakamoto is. Both were in possession of huge sums of bitcoin (Mt. Gox had about 750k and Satoshi has about 1M). What better way to increase the value of their coins than to start, or perpetuate the trend of a marketplace that used bitcoin as its currency?
What do you all think?
NOTE: You all probably think I'm obsessed with SR. I'm not, lol.