I don't understand any of this, nor do I ever plan on trying to. I was just curious as to what the heck his D-tilt, and U-tilt were supposed to be.. and why they looked like they'd never land. Actually, a lot of his moveset looks like it would never land.
Only thing I really have to add to this, is that it seems people are trying too hard to think of a moveset for a character that in all reality, would be fairly similar to Sonic if he was actually in the game. There's a lot of neat ideas, but it would just seem easier, and more practical to keep certain moves the same/similar as it is on Sonic's moveset.
Special moves (besides a spindash) seem like they could/should be changed up, but more basic moves like dash attack seem like they should just be kept the same/slightly changed. Example: the third hit on jab. It's different, but similar. Although I honestly have no idea what the heck he's hitting him with. The point is, that it's a simple noticeable change that makes enough of a difference between the two.
With all that said, just wanted to say that I'm not trying to say any of the things that have been done so far are bad. I'm actually quite excited that Tails in Brawl is somewhat possible. Good luck with all of this crazy stuff that I'll never understand. I look forward to using Tails regardless of which way you all decide to go with his moveset.