To answer OPs question: this happens quite a bit. Aging player in KD, Kawhi, and LeBron get slower, less athletic while developing “traditional” post moves in later life. That, coupled with the small ball meta of today’s NBA, would obviously shift them over to the 4.
Liked the idea until I read that it doesn’t mess up the record books.
What if the Celtics go 72-10 and also win the NBA cup? All of a sudden they have the most winningest season in NBA history with 74 wins