Reversing Dudley jab MGB with Ken SA3

I live on my own with no room mate in a really small basement apartment. I also dont have a console or any sticks or even a TV because the family that owns this house sleeps at 8pm and i get home from work at 7:30pm and i’ll get kicked out if i’m too loud.

Can someone please explain the properties of jab mGB and when ken can and cannot reverse it with SA3 after testing?

Edit: i’m referring to arcade testing. I know that on the PS2 you’ll reverse the jab MGB successfully every time. Arcade is different.