There has been a lot of speculation that Redbone is Fretkillr (and also that Fretkillr might be Pat Donahue) but as far as I know, Redbone doesn't ever present himself as a flatpicking expert, which Fretkillr undoubtedly is.

If Redbone is in fact a flatpicker, I stand corrected, but I just don't think the man playing guitar in the Fretkillr videos has the same physique as Redbone, as far as it is possible to judge.