Why do you assume Mercedes are driving these changes?
Why would they do this if they are also affected?
I think Mercedes involvment is overstated.
By the way Russel came out and deffended the sidepod concept. He said it's worth sticking to this year and changing concept could in fact make the car slower.
The team are expected however to have some hybrid concept between zero pods on the sloped pods and bath tub pods i think.
Squaring off the zero pods and havng a smooth ramp to the rear, with floor struts underneath would be a logical move.
Next would be trick suspension and a new nose to be the fastest.