Why would you need to create parallel construction when the process of finding out Ulbricht's identity was painstakingly simple after basic utilizing basic OSINT?
He posted stupid things in very public and monitored places and it only took a little research in the right places to put the pieces together. The economics of the parallel construction theory are simply untenable. Anyone can search for keywords on Shroomery and other forums. It's grunt work and loads easier than actual hacking.