Joey and David's recast for the Two Headed Monster, I'd say is a great example of characteristics and chemistry over voice imitation. They have been playing a LOT of duo characters over the years, Humphry and Ingrid, Joey and Davey Monkey, Papa Bear and Baby Bear. And that's just 3 examples. They have the perfect behind the scenes chemistry that make a symbiotic character like 2Head come across flawlessly. The attitude and performance are remarkably like the original performers, even if the voices sound a bit higher and less gruff. Jerry and Richard had the most unmistakable, unique voices of the troupe... the Fraggle Rock cartoon shows that they aren't easily imitated (especially with Junior Gorg. Guy didn't even try).