The fact that DDD has or does not have effect on the wake is a bit too complex to be discussed on a forum.
The idea was that indeed the coupling with the rear wing was a bit problematic but also that you have strakes into diffuser to help with pressure recovery and those strakes create vortex at the exit of the diffuser hence why i told you the drag has nothing to do here with the cleanness or not of the diffuser.
AFAIK, nothing has been proved, only two studies have been done and none was conclusive; The DDD was banned for pure safety reasons.
In general, diffusers turbulences are not a good thing because the proximity of the ground make them persist quite long time (=long distance) that's why the OWG advised to have more downforce from the rear wing.
The strong upwash from the rear wing cleans the turbulences from the diffuser.
I repeat my opinion here, but trying to get a weak wake is too hard for F1, cars are different meaning they react very differently to the wake signature, plus while nothing has been proved it is possible to imagine teams making the wake turbulent , or at least not trying to make their wake ok and finally all regulations tend to increase extreme optimum solution i.e solutions that use a certain design to the max meaning they get very sensitive. It would be far easier to clean the wake and so far, all indycar project, OWG F1 regs tend to go that way.
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