 The common thread is how Jack honestly believes he is the most important person around and only his needs and desires matter.The characters of Jack Sprat and Jack Ketch have been established as completely separate entities from the Fable Jack, who is in fact a representation of Jack Horner.In an interesting plot twist, it was recently revealed that Jack was not, in fact, involved in the Beanstalk or Giant-killing incidents, but is actually an unknowing copy of an older fable named Wicked John.