Your Olympic (extreme) power-gamer may know how to run and jump real high every single time, but this is a pentathalon where more than that matters.
Exactly. If your power gamer is willing to be the Olympian who can run and jump real high every single time,
but stands no chance whatever in the pentathlon, that's his choice. If the GM points this out to him during chargen and he still makes that choice, well that's what the guy wanted, okay.
From where I sit, the only "problem" that creates is that it puts the responsibility on the GM to make sure the game remains a pentathlon, rather than limiting it to running and jumping so as to conform to the strengths of his players.
And no, I'm not suggesting that the dynamic DP system is flawed, I am suggesting that min-maxing and power gaming is one of those things some people do, both in RL and in the game. As folks here have pointed out, it carries a price. If he's willing to pay it (possibly to his death), I don't see any reason not to let him.