(Salacious detail alert!)
The initial investments were made by Michael Kopper's gay lover. Kopper wasn't an executive officer, and since he had no legal relationship with the person in question, that satified the "arms length" legal requirement.
Except for the fact that the money he used was laundered from Fastow and Kopper.
One of the internal complaints about Fastow's SPE is that Kopper was both an Enron and LJM employee. At some point in time, Fastow defused this by assigning Kopper (and the LJM team) full-time to LJM. However, he didn't move them out of Enron's office, and Fastow himself sat on both sides of the deal. He was supposed to move the LJM people out of Enron entirely, but that never really seemed to happen....
ever see Wag the Dog? Remember the part where Dustin Hoffman's character is watching the news wherein they are reporting on the President screwing a "Firefly" Girl? Hoffman's line was classic and appropos:
"Oooooheee, he's F'ed"
Not with malice or glee, just a statement of fact.
I concur.