I stand corrected. Their voices are different but I thought perhaps Ruddy Thomas was one of those vocal "chameleons" in reggae. However, the pictures on School Days indeed don't look like Ruddy Thomas (the idea to check the pictures was apparently too complicated for me to come up with myself
). The confusion over the Flick Wilson name is obviously wide spread, the reference to Ruddy Thomas is mentioned "everywhere", so thanks RB for the clarification.
Now that I know he didn't just go back to being Ruddy T., I wonder what happened to the younger Flick Wilson - he seem to have disappeared after only a handful of recordings made around the same time. Anyway, looking forward to more releases from him.