Scotty is fine.
YES, his ribs are not the same shape as other cats, but the vet says this will be a part of his unique personality.
The vet feels that Scotty either had an injury early in life or malnutrition. Since he DID come into the rescue at about 4 weeks of age as a VERY sick little kitten (close to death) this might just be the case.
So Scotty should grow up just fine. :D :D