Well if you've ever seen someone perform the CG, you'll see that quite often they get much higher than 16%.
A lot of the time, grabbing while not moving works fine, you can also dash away then dash towards where you were standing to turnaround quickly and grab them again. It works well enough if you're fast enough.
I've never actually seen a space animal shine out of the CG because usually it stops at like 30%ish then they get up tilted or uair'd (Or whatever percent that they are high enough for a tipper) I'd imagine the window is quite strict to shine out of it. Falcon can SDI of pikachu's chain grab on him but I've literally never seen anyone do that so I think it's just "one of those things"