The following was sparked by some of what I read here, especially crazedrat:
This could be subtype related, I'm not sure, but I've been thinking there is a similarity between the following types:
In the first pair, there is a 'transparent' S as Base, but the ESFp's Fi/Te and the ISTp's Te/Fi make them appear to be similar in temperament or probably even thinking patterns.
Not to pad my own theory, but it's interesting because some members here show faint reason to believe it. Woofwoofl holds himself to be dualtype SEE-SLI; Traveler was once confused between INTp and ENFp, FDG and Ashton are typed SLE by some, Marista has been mixed by others with EFxj and IxFj etc. Labcoat for INTj/ESTj.