attached an other example of missing wire from GPU
Your are not supposed to see the wire while the GPU is still in movement. In addition to that, the other screenshot you posted show an airplane that has its own GPU cable so, it's entirely correct the GSX GPU won't add its own cable, otherwise you'll see two cables connecting to the airplane.
In fact, the GSX GPU in MSFS always assume the airplane comes with its own cable, which is how all default airplanes are, so it connects (assuming the airplane configuration is correct ) to the end of that cable, without using its own.
The GPU own cable is there, but it's not really used in MSFS, only in P3D, where the standard wasn't having planes with an integrated cable that comes out, so there's an animation for it.