Exactly!  This 'humanimal ecosystem' is no different than  than a comparable ecosystem in Nature, except animals compete, our topdogs can purposely choose to cooperate for advantage.  Natural keystone species like lions, elephants, hyenas, crocs, hippos, etc all contend for comparative advantage; a 'tight' feedback loop develops to maintain a rough equilibrium.

The topdogs you listed above can create coalitions to vastly elevate their powers.  Imagine if the real crocs and lions formed a coalition to ease their mutual harvesting of prey.  The lions would drive the game into the water where the crocs are plentiful, and in exchange, the crocs wouldn't attack the lions, and share half the kill.  Both get very fat and happy with a much reduced mutual effort.  Of course, the wildebeest, zebras, and other animals won't be very happy about the 'team effort' results.

OPEC, and the TX RR Commission were/are team efforts in the energy field.  The IMF, World Bank, and various country  federal banks could be another organization.  The CFR, Bilderbergers, etc could be another.  But it is next to impossible to determine how much shared cooperation exists among all these entities, over and above the mutual desire to generate profits.  Recall that Jay Hanson said that wordless cooperation can be signaled by body language alone-- no records and nothing to prosecute against.

Bob Shaw in Phx,AZ  Are Humans Smarter than Yeast?