Seeing as Elop's $6M pay is orders of magnitude smaller than Nokia's $25B market cap, you don't need to be very accurate. Say my 10% was wrong, even wildly so. As long as Elop gives Nokia more than 0.024% improved odds over his next best alternative, he is still worth $6M.
(Yes, I'm ignoring the time value of money, risk, etc, to simplify.)