I was playing around with Oni in training mode with the opponent in the corner. I noticed that if I jump up and do light Zanku Hadosho (air dash), he flies forward until he reaches the end of the stage above the opponent. Now if I do EX tatsu while he is still in the air, Oni falls quickly while doing the EX tatsu. Sometimes he hits the opponent from the front. However, sometimes Oni hits the opponent from the other side so that the EX tatsu hits as a cross-up. My question is how do I control whether the EX tatsu hits from the front or as a cross-up. This setup seems pretty useful as it seems impossible to tell from which side Oni is attacking.
It looks like the same ambiguous situation can be created if the opponent is not in the corner. You just need to judge the distance of the Zanku Hadosho correctly so that Oni ends up right above the opponent before doing the EX tatsu.
If this is old news, could someone link me to the explanation.