In a thread I posted this, but I decided to make my own thread. This hypothesis is based off of no videos or anything, but only on topics of some threads and some posts. I saw somewhere that alphazealot said wavedashing is not in Brawl, and then I was like "Where the **** have I been!'. Wavedashing, which only exists because of the Directional Air-Dodge. Anyway, I hope what the following says is true.
Maybe in order to have a momentum air-dodge you just leave the dpad/control stick in neutral position, and for a directional you postion the control stick/dpad. This occurs in melee, when you are flying fast through the air or tech after flying fast through the air and fly off the stage, it doesn't matter if you air dodge with the control stick in neutral position, you will still go in the direction your momentum is heading. So, maybe Brawl has just increased the sensitivity (not the right word, but whatever) of the momentum's effect on the air dodge. So in order to do an air-dodge where you stay stationary you may have to : a) air dodge at max height so there is no momentum or, b) air dodge in a direction so it cancels out the momentum. For example, if your falling down, you must directional influence the air dodge up, which results in a stationary air dodge. I haven't been keeping up with all of these threads and posts about this, but here is one of my guesses.
Maybe in order to have a momentum air-dodge you just leave the dpad/control stick in neutral position, and for a directional you postion the control stick/dpad. This occurs in melee, when you are flying fast through the air or tech after flying fast through the air and fly off the stage, it doesn't matter if you air dodge with the control stick in neutral position, you will still go in the direction your momentum is heading. So, maybe Brawl has just increased the sensitivity (not the right word, but whatever) of the momentum's effect on the air dodge. So in order to do an air-dodge where you stay stationary you may have to : a) air dodge at max height so there is no momentum or, b) air dodge in a direction so it cancels out the momentum. For example, if your falling down, you must directional influence the air dodge up, which results in a stationary air dodge. I haven't been keeping up with all of these threads and posts about this, but here is one of my guesses.