I think she and Jeff have probably revised their stories over the years to make themselves look as victimized as possible. And Shawn is conveniently dead now, and cannot refute whatever BS they come up with. (And it's apparently working to pin the blame on him, as bardtoob and others here have demonstrated.) And that is beyond appalling and frankly, ridiculously funny to think that he could have masterminded the whole plot. Yeah, he was one hell of a espionage expert and brain trust, folks.
Shawn was certainly delusional, possibly even schizoid. Did you see his interview with Diane Sawyer? A complete mental case. He wasn't however, completely harmless. After the shit hit the fan he met with the preacher he went to vocational school and originally spilled his guts to at a local restaurant (the preacher was wired by the FBI.) The FBI trailing Shawn saw him load a gun into his car and told the preacher that under no circumstance are you to get in the car with him. First thing Shawn says when they get into the restaurant? "Let's go for a ride." The preacher refused to leave with him.
The guy "Derrick" was apparently Shawn's "pot dealer" and survivalist friend while the "hit man" Shawn Stant was Derrick's nephew. Derrick has never once spoken out about anything and Shane Stant is about as delusional as Shawn. He actually opened a 1-900 line in 1994 trying to sell "plot points" and other information about the assault, including Tonya's supposed involvement for 50 cents a minute. He's since told the 30 for 30 director Nanette Burstein in 2014 he has no idea if Tonya was involved.