 When Muhammad Ali says “I am the greatest”, he’s definitely giving voice to his self-locating doxastic state (which Lewis would characterize as self-attributing being the greatest), but that doxastic state is not, and is not intended to be, transferred to his interlocutors. Ali wants his interlocutors to get in to the “Muhammad Ali is the greatest” doxastic state, not the “I am the greatest” doxastic state. And it’s the former, not the latter, that addressees who take Ali at his word will in fact get themselves into.