Not sure I follow. If his ownership stake is cut in half, and the ex-wife owns half of Bezos' stake in Amazon, that effectively cuts his power in half.

Sure, right now they are likely on the same page, but what about in 5 years? What if she starts selling her stake or sells her decision-making stake to an activist hedge fund, for example, or someone directly adversarial to Bezos? It could make things a lot harder for him to lead the company.