there's useful stuff to know that doesn't necessarily "up" your combo potential, either.
definitely a valid reqeust, though, not a lot of stuff is obvious, even after you play the game for a bit.
i think it's a matter of the aerial opponent's hitboxes being lower than expected.
you can even get the same effect if you get Sol to run at I-no, instead of GVing -- he'll completely evade the H Dive with his running hitbox, allowing you a free WT combo if she doesn't FRC!
btw, i could only replicate it with Order Sol as he was falling from his airdash. i was able to GV under the airdash, itself, just fine.