Heavy projectile spam, let alone projectile spam, I can agree to.
Aerial prowess? Sonic has that covered, maybe not enough to safely gimp Zero Suit Samus no, but it is enough to compete, evenly if I may add. I'll settle for ZZS > Sonic, but please don't think Sonic is Snake when compared to helplessness (even though Snake has his monstrously powerful and fast yet laggy at the end aerials)
Zero Suit may be a fast-faller, but you admitted to her being LIGHT, and it doesn't matter if you're able to fastfall, in fact this doesn't help your case.
If you want an extreme example of your characters' attributes, look at Fox, he is another light fastfaller, and yet do people know the character for living for a really long time? No, that would be left to D3, who is a heavyweight to back up his fastfalling. Wario is another heavy but in his case he is floaty so that just helps his case, Samus too but to a lesser extent.
A.K.A. It doesn't help to be a fastfaller, it also doesn't help to be light, period.
Bair being decayed is a player fault, it is suppose to be a kill move and if it is used to damage I'm sure that better players will be able to refresh it later on when it counts, or they would save it for the kill when it will be needed.. There's no theorycraft from my posts when it comes to MUs, only what works and why/how it does.
That was addressing you're second to last post here, BTW.
Are you talknig about SDIing Sonic's Fair or Zero Suit's Fair?
I'm gonig to assume you're talking about Sonics, and if you are you have the right idea but the wrong way to get to the result.
Well, at least with descending Fair, which is where it should be used anyway, I'm certainly not going to try to attack you head on with Fair which doesn't have that much range until the end. Again I don't theorycraft/worry about what bad players do, good Sonic's would be attacking you with Bair.
If you really want to DI Sonic's Fair, it depends where you are. If you're in front of him and/or haven't been hit yet, you want to DI away. This is also assuming that he just started it up, not almost ending, in which case hope you don't get hit by the last part.
If you're caught in the middle, DI towards his back.
If Sonic's Rising with his Fairs and you're above him, I hope you have Godly SDI to back up Ding down, otherwise you're going to eat it. If you're below him when he's doing Rising Fairs feel free to DI down, though I don't know how often this will happen, my guess is not very likely.
Descending Fairs? Oh yeah as I already said before, they're bad, since they'll put Sonic in a fish-like state if he touches ground, but again nobody who is any good will leave them open oh heavens no.
Bair is disjointed, it is much easier said than done to work around this.
I hope I don't need to explain Uair, being that without D3s Mallet and G&W's... whatever he does, it's the most disjointed Uair in the game. Happens to be fast too. Both characters don't want to be above either really, options become limited there.
Now this is silly, I feel like this discussion is wearing out longer than it should be. I should just stop here and let you do whatever, I've done all I can up to this point.
Edit: I'm too slow.