JI1 really is one of the best universal AAs in the game, Jumps don't take several frames to come out like they do in MK9 so a 5 frame Jumping attack is actually pretty viable for AA
His D2 can AA if you opponent did his jumping attack early, You kinda duck the end of their attack and launcher them with your legs. Of course this does depend on the Jump in
I have mixed results with his MB F3, most of the time i get hit and my opponent just blocks it after they land, MB F3's effectiveness probably depends on how long a characters jump animation is now that i think about it