I totally agree. R allways meant Resistor plug to me and one thing I always like about Benz ignitions is they never opted for the easy out of going with resistance wires.
So adding another 5K resistance to the plug when it already has a 2K resistor sitting on top of it is a waste of ignition power.
On the older Benz, the Euro resistors were 1K , but the US versions had to have 5k in order to satisfy the US Gov. regulations on radio supression.