MotoGP, Ducati: what's the point of the 'glove box' on the tail of the GP25 lab?

We told you about it during the shakedown: Michele Pirro tested a brand new tail with additional appendages next to the stegosaurus-like fins. Here in this image is another angle taken from the MotoGP Tech Facebook page.
As you can guess the two 'tubs' are in rapid prototyping, a sign of work in progress.

In the image is Pirro riding in a VR46 team pit exit (you can see their starter). There have been heated discussions about the use of the device, which, wittily, motorsport colleague Franco Nugnes called a 'holy water tank.' They range from increased aerodynamic load to a...disruptive action for the pursuers due to the increased air turbulence generated by the two tanks.

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