As many have already pointed out, it’s curious that the Panama Papers mention no Americans.

And

Therefore, I suggest that the purpose of the Panama Papers operation may be this: It is a message directed at the Americans and other Western political leaders who could be mentioned but are not. The message is: “We have information on your financial misdeeds, too. You know we do. We can keep them secret if you work with us.” In other words, the individuals mentioned in the documents are not the targets. The ones who are not mentioned are the targets.

Kontrol, the special Russian variety of control
In sum, my thinking is that this could have been a Russian intelligence operation, which orchestrated a high-profile leak and established total credibility by “implicating” (not really implicating) Russia and keeping the source hidden. Some documents would be used for anti-corruption campaigns in a few countries—topple some minor regimes, destroy a few careers and fortunes. By then blackmailing the real targets in the United States and elsewhere (individuals not in the current leak), the Russian puppet masters get “kontrol” and influence. 

?If the Russians are behind the Panama Papers, we know two things and both come back to Putin personally: First, it is an operation run by RFM, which means it’s run by Putin; second, it’s ultimately about blackmail. That means the real story lies in the information being concealed, not revealed. You reveal secrets in order to destroy; conceal in order to control. Putin is not a destroyer. He’s a controller.

Eoin Treacy's view

This article is by definition a conspiracy theory but if it raises legitimate questions. The Great Game is alive and well.