This is clearly not true for anything where being the top C requires innate physical abilities. You mentioned basketball. But the same applies to anything physical.
My own little anecdote. I have Cerebral Palsy. This isn’t a woah is me statement. It really only affects my left hand and slightly my left leg. Most people wouldn’t even notice besides a really slight limp.
I spent 12 years as a fitness instructor as a working hobby. No matter how much I practiced, I wouldn’t have been able to do what other instructors could do. I synthesized my own none choreography heavy, fairly simple, very athletic style. But it got to the point that I knew I was the best that I could possibly be and I once my style started going out of fashion (step, cardio kickboxing) and the industry got to be more dance focused, it was time for me to hang it up. I also start focusing more on my career and my then new marriage and step sons.
During the latter part of the period when I was teaching, I also started running. I was decent - under a 10 minute mile up to a 15K. But every time I tried to push harder - either longer or faster - my slightly favoring my left leg caused my right leg (good leg) to experience problems or my left ankle to start hurting.
Even lifting weights, something I have always had an affinity for (and my CP doesn’t affect) and at my strongest I could bench press 300 pounds at 5 foot 4 and a weight of 175 pounds, I would never be able to lift what my 6 foot 3 200 plus pound step son can get to with much less training.