Consider, too, just how much of the jarhead remains. Their brain and some extra bits are all that is left, and this is stored in a special life support container (the CCU). That container is like a metahuman's armor and clothing, while the drone body it is installed into is not just like a vehicle but really is a vehicle for it. Saying a jarhead can be directly targeted by their aura alone through their drone body is like saying a metahuman can be directly targeted by their aura alone through the tank they are sitting in.

Pretty much, it's just a matter of scale. And considering that the "drone" bodies a jarhead can be plugged into include actual vehicles...

ALL Drones are Vehicles, not all vehicles are Drones.

All vehicles are equal. But some vehicles are more equal than others!

AND the RAW explicticly mentions how to target cyborgs / head in a jar beings...so we all are clear. ^^