Even if we don't consider the events after 1967 for the MAJORS balances, it's clear that Laver won 5 US Pros and Rosewall 3 altogether. But it's a significant difference between majors till 1967 and "normal" events in open era. For instance Rosewall's 1971 US Pro win is important for his 1971 ranking (a tough tournament win) but not for his all-time majors sum. Note: I do not think so because it's "better" for Muscles. I would think so also in the reverse case!