Gravitational wave detection is nowhere near the first step to any sort of warp drive. In fact it is looking the like the nail in the warp drive coffin. I, and no doubt many others here, was hoping the new detectors would be picking up all sorts of tiny wave sources buzzing around us, a civilization of warp drives just beyond our previous limits of observation. But no, no tiny warp signatures. We are still alone. If ET is in our local galaxy he isn't using warp drives, only reducing their possibility.