In 1982, while I was working for Congressman Manuel Lujan of New Mexico, a man came up to a me during a gathering in Albuquerque and introduced himself as Terrance J. Wilkinson. He said he was a security consultant and gave me a business card with his name and just a Los Angeles phone number.
A few weeks later, he called my Washington office and asked to meet for lunch. He seemed to know a lot about the nuclear labs in New Mexico and said he had conducted "security profiles" for both Los Alamos and Sandia National Labs.
This sounds like Wilkinson was active in New Mexico in 1982 and thereabouts. Wilson would've been in Africa at that time. I haven't heard anything about him being familiar with nuclear labs, either, so I tend to think it's someone else.
However this does suggest to me that "Wilkinson" might be someone tied to a spy ring at Los Alamos in the early 80s, which might be a clue.
Of course, this was based on the assumption that Thompson had made up the whole story and, having been caught, covered his tracks.
In hindsight, we now know that somebody was trying to peddle this story, though. So, Thompson would've had no apparent need to make it all up.
The possibility remains, though, that he might've been covering for somebody whose real identity he couldn't reveal for some reason. William McKinley, as I recall, tripped him up by convincingly establishing the fact that there was no such person as "Terrance J. Wilkinson".
If we take Thompson at his word, though, Terrance is "a CIA advisor". If he's not Wilson, that's still plausible -- Plame probably wasn't the only CIA-associated person in on this stunt.
Wonder whatever happened to Thompson. Wonder if he'd talk about this now...