This headline seems unbelievable, but if all the evidence in the article it is actually real, it does cast some reasonable doubt.
An alternative which hasn't been discussed yet is that maybe Karpeles was the Dread Pirate Roberts and then Ulbricht was. It has long been theorized that, like the original name from The Princess Bride, the title "Dread Pirate Roberts" was passed from person to person. DerYeghiayan seems to have had some reason to believe that Karpeles was DPR, while the prosecution seems to have reason to believe that Ulbricht is DPR. Why not both?
An alternative which hasn't been discussed yet is that maybe Karpeles was the Dread Pirate Roberts and then Ulbricht was. It has long been theorized that, like the original name from The Princess Bride, the title "Dread Pirate Roberts" was passed from person to person. DerYeghiayan seems to have had some reason to believe that Karpeles was DPR, while the prosecution seems to have reason to believe that Ulbricht is DPR. Why not both?