Probably because Commander Brown recommended both men, the official citation incorrectly stated Sweeney was a member of the crew of Jamestown''.
pɹˈɑːbəbli bɪkˈʌz kəmˈændɚ bɹˈaʊn ɹˌɛkəmˈɛndᵻd bˈoʊθ mˈɛn, ðɪ əfˈɪʃəl saɪtˈeɪʃən ɪŋkɚɹˈɛktli stˈeɪɾᵻd swˈiːni wʌzɐ mˈɛmbɚɹ ʌvðə kɹˈuː ʌv dʒˈeɪmztaʊn.