old ray and wb got their own excuses about not touching a sword in years or having heart attacks
garp is pretty healthy
and he was still bodying kuzan
no matter how much u cope , oda was showing garp actually manhandling kuzan in their 1v1s and even including other pirates attacking garp
he was getting jumped and thats why he lost
meanwhile this is what we have of garp and kuzan in a pure 1v1
garp is clearly being shown as the superior fighter no matter how much u twist it