Many of the Beatles' answers to questions about their origins in the early days of Beatlemania were short, simple answers, avoiding any unnecessary elaboration. Example: "How did the Beatle haircut get started?" Early answers: "This is how we look when we wake up."; "We went swimming one day and didn't bring combs", etc. They didn't feel the need to discuss Stu and Astrid at that stage of the game. The Beatles seldom mentioned Hamburg, Pete Best, Klaus Voorman at all.
The day after the "Pete Forever, Ringo Never" fracas at the Cavern, George's explanation for his black eye was that he walked into a double-decker bus. No, seriously. I think that story was suggested by Brian Epstein to avoid making the incident a big deal. That's just my opinion.