As head of the most profitable US bank, JPMorgan Chase, CEO Jamie Dimon is a natural choice to lead the industry in its battle to curb higher capital requirements. For one thing, he has the most to lose. Analysts estimate profits at the New York-based bank will top $20 billion in 2011. While regulators continue to struggle to implement the hundreds of rules passed by Congress last year as part of the Dodd-Frank Act, Dimon is questioning the cumulative effect of financial reform. To his credit, Dimon was able to steer his bank profitably through the worst financial crisis since the Great Depression with a 7% capital buffer.