Dave,
I think you used those web sites, so I criticized them. I guess someone ELSE posted them in your comments. Those Nazis are everywhere...
Nonetheless, the only 23 Flettners ever built were built around the same time as the 130 R4's. Seems like a draw to me, at best.
The shipboard landing of the Flettner seems to have been performed first, but specific dates are hard to come by. Perhaps the Flettner experimental helos were first. Perhaps not.
It is interesting that you cannot help but grab obsolete data from Jurrasic helicopters to support your theories. With approximately 25,000 aerospace professionals employed daily in helicopters, and world helicopter expenses in the $10,000,000 every year, precisely how many dollars are being spent on your pet configuration?