Thanks for posting that. I'd sure like to read the whole interview. Is it online somewhere, or could you scan it for us?
This is all fascinating information I had no idea about after all these years. I, too, would love to read the entirety of the Matt Jefferies interview. His views at the time of FJ's work are rather illuminating.
There's no additional info in the interview about Jefferies' views of FJ, but here you go
Don't forget that this was done in 1976.