It doesnt prove anything. If it proves anything then it is that people put more weight on the second half of the season than the first half. The hierarchy of trophies in terms of Ballon d’Or is:

World cup
UCL
Euros
League title in 🏴󠁧󠁢󠁥󠁮󠁧󠁿🇪🇸
League title in 🇩🇪🇮🇹🇫🇷
Copa America
AFCON