The jury is out on whether the accounts linked to the hiring of the 'hitmen' was exclusively under the control of Ross Ulbricht.
The 'preponderance' was found by a judge, not a jury, so it's a different threshold than say demanding a jury in a civil suit where the jury would make a finding on preponderance. You effectively have a jury of one, where that jury member is highly intertwined with the same federal government that is prosecuting the crime, in a way that would surely eliminate them in voire dire for an impartial jury.