Just speculating: The Pistil is Maverick and the Stamen is Goose.
The Pistil syncs 2-way with the robot's neural system, all her motoric and sensory functions are intercepted by some sort of neural connection, allowing her to pilot the robot directly. Since she can't other systems in this state, all the raw technical data (combat sensors, weapons systems) are carried through her neural system, decoded and displayed to Stamen in a comprehensible form. He controls all the systems that can't be controlled mentally through neural connection by the Pistil due to their abstract nature, like fire control radar, weapon's internal systems or mechanical systems that can't be mapped to a bipedal skeleton. He also has some sort of neural connection but it's hard to tell what purpose could it serve other than taking the strain off Pistil's neural system.
Of course most of this is probably bullshit and they just did it for the innuendo.