I checked the tiny G13 and it had on lone skinny taproot coming out of the cube keeping the plant alive. I suspect the others have a root or two more.
Definitely goes up as a fail. The other thing I tried with the seeds the holes were too deep. All 6 popped, but got hung up in the tube.
There's a way to make it work I'm sure. Skinnier cube, shallower hole, don't put in dirt until you see roots. I'm done playing with it.
If anyone that wants to try, I had 100% pop consistently. the method was just off.
Positioning dry seeds in them, then flooding the tray for 24hrs, then draining the excess worked great for germ. If you were doing a lot of seeds it could definitely be a thing.