Please share what you found :3
Sorry only just got around to testing it and it's not as good as I hoped... It's more of a gimmick than anything
Anyway against some characters (Need to test more, but I know it works on Jiggs and Ness) you can do a grounded grab release that leaves them in perfect range for a sweet spot Utilt. This is very useful for kills since most opponents seem to try to press buttons after grab releases.
Unfortunately I was trying to test whether it was guaranteed and it turns out they can shield it.
Worse yet, since after a grab release you can't regrab for a few seconds (Grab will pass through them), I don't think you can punish them putting up shield (Could be wrong; shielding could remove the grab immunity; didn't think to test it as I didn't have much time with 2 consoles).
Some other characters are at sourspot Utilt range, but IDK if that's really worth it. That said you can connect with DA/Ftilt/Dtilt after, but they can shield that too I assume.
I also wanted to see what we could get off of an aerial grab release and unfortunately I don't think anything connects (Only tested diagonal MB which does not work since again, very little time to test). If someone could test if we can Usmash, Nair, Crash bomb or DA though I would appreciate it. I think they can jump out, but it would be nice if anything were guaranteed.
That said a grounded grab break near the ledge makes them fall off the stage while doing that grab break animation, allowing you to set up gimps/spikes.
It also seems like Leaf Shield does not stay out long enough to connect after a grab break, and it may even just disappear as soon as the break happens.