Big agents can be more coherent than small agents, because they have more resources to spend on coherence.

Yes. Coherence, and persuasiveness.

The individual that argues against whatever political lobby is quick to point out that the lobby gets its way not because it is right, but rather because it has reason to scream louder than the dispersed masses who would oppose it. But indeed, the very arguments the lobby crafts are likely to be more compelling to the masses, because it has the resources to make them so.

The lobby screams louder and better than smaller agents, as far as convincing people goes.