The only thing I know is I read once a Medical Doctor and Scientist with special ability was given Citizenship without being permanent Residant.
Please provide a link to the bill or law that granted this special citizenship, otherwise I'll take it as hearsay, and that whomever wrote the article made a mistake Think about it, there is no reason to give direct citizenship to a medical doctor no matter how special he is, permanent residency is probably good enough for him/her.