Yeah, I saw that when it was posted on the Lucas boards.
I already knew about the Ledge Whipping. It's sometimes useful, but against players who know how to play against it and know that it's there, it's hardly of use sometimes.
He never got a true D-air>D-tilt Lock funnily enough. The one time he was able to get that combo was when the Snake was not at a high enough percent to get locked. Instead Galeon got lucky and got a trip with tipper d-tilt. That lead to the grab he got. If you want to know more about how jab/d-tilt locks work, just send me another VM and I'll explain it to you. It was for that reason that he was not able to get more d-tilts. If he's not getting D-tilts outside of the D-tilt lock, he's going to get punished for landing it on hit. (exp. 11:32).
As for momentum canceling the two best aerials to use are b-air and n-air actually. But the frame data for b-air, n-air, f-air and u-air are so similar that it doesn't really make any matter.