There is a lot more to a vault than the definition. There is a reason you can’t just watch a YouTube video and get an understanding of the vaulting process. Just because you can do something doesn’t mean you know how to do it, or how it is done; performance is not understanding. This is very evident when it comes to vaulting.
Shaping a Leaping Catch can, and should be a full time job. Always throw with the intent to deliver the leaping catch unless working something specific that requires a specific approach, speed or distance that is incompatible with a leaping catch. Out throws are glory, not afterthoughts.
Within a game of disc dog freestyle there are many opportunities to reinforce and shape the leaping catch and to turn the speed regulation required for the leaping catch into a habit that is ever present in your freestyle game.
Reading the disc is a skill that astute dogs and humans pick up rather quickly. The float, the spin, and the speed can reliably be gauged and predicted after several reps. Of course this changes with wind, disc choice, and throwing ability but, generally speaking, the flight path of a disc is easily predicted.