c_nul

For frame advantage make both character jump (mirror match) after a move on hit or block and compare them during the jump to see who jump first and how many time before the other. Becareful to not use this with jump cancel move, try another thing like crouching or moving backward though usually jump is the best option to figure out the end of a move

If 5A can whiff versus some crouching opponent that means 5AAA can whiff on ALL characters at max range, no ? (i don't have the game yet)

When i watch your video (nice video by the way) i think it could be 35 frames of startup if you watch the animation instead of the input. I know a lot of games where the input data have a lag display. So when you input something it could be possible the game show this only after several frames. In SF4 it's one frame after but maybe in Persona 4 it's 2 frames after