Say I grab and release Falco and it's a ground release. Who can move first? And can you buffer a move?
When any character gets a ground release, they suffer from 30 frames of lag. When any character gets a jump release, they suffer 50 frames of lag. When a character releases someone from a grab, they also suffer from 30 frames of lag.
There are 4 exceptions to these rules however.
Bowser only gets 20 frames of lag when releasing people from grabs, so ground releases give him a frame advantage of 10. Jump releases give him a frame advantage of 30.
DK only gets 20 frames of lag when he gets ground released from a grab. So if you grab DK and he breaks out with a ground release, he has a frame advantage of 10.
Ness and Lucas suffer from an extra 10 frames of lag when they are ground released. That means that every character in the game has a 10 frame advantage over Ness and Lucas when you ground release them. Bowser has a 20 frame advantage.
And you don't have a real frame advantage over Falco. The only reason why her Jab can hit Falco out of a grab release is because her jab is frame 1. Falco doesn't have any action that comes out that fast, since shielding, spot dodging, and jabbing comes out on frame 2. The only thing that comes out in one frame is a taunt. Taunts come out on frame 1.