So you count all sides of the rotor and say that each one completed is one cycle? Wouldnt it be just as correct (arguable more so) to say a cycle is intake, compression, power, exhaust? this is 654cc per housing, regardless of what other stages of the process other parts of the engine are in.
Seems you are muddying the water by changing what is defined as a cycle? To complete 3 sides full cycle the rotor has made more than one complete rotation, seems a bit of a funny way to count displacement to me.