Conversation so far:
Why did Willie McCovey return to san francisco?
CANNOTANSWER.
Can you tell me about the return to san francisco?
McCovey began 1977 as the active home run leader with 465.
Was he successful as being the active home run leader?
he became the first player to hit two home runs in one inning twice in his career (the first was on April 12, 1973).

Question: Are there any other important information regarding this?
Self-contained rewrite: Are there any other important information regarding Willie McCovey other than his success as active home run leader?