Considering how far a fair and needle storm would carry Meta Knight across the stage, you're probably not gonna have enough stage left to land a grab release DACUS afterward.
Still prematurely excited about situational combo setups that you can't be bothered to test, I see.
You do have one part right, though. You can land a dash attack (kinda stupid, DURR HURR I'M GONNA HIT YOU FOR 7%), grab, or running usmash after the needle storm forced reset. I believe the running usmash can double-hit on ROB and Samus if you time it right.
You can pivot grab.
You can also f-tilt.
I don't test because someone cannot test combo's by themselves's.
Here's the video you're talking about
http://www.youtube.com/watch?v=sXV4uyKMptg
Also, <3 is correct when saying that being caught in the wind during hitstun soft-spikes people. This is what all of those OMG SHEIK VANISHED KILLED ME THEN SAVED ME vids are about, because if they happen to DI the way you do, when you vanish, regardless of percent, then they'll be caught in the reappear wind and sent straight down, rendering them immobile until their bouncing animation is over. If you guys want, I could make a vid showing off some of the things you can do with it.
I messed with this combo as well and this is what I found.
There are three ways to catch someone.
#1 Catch above them (foe at lower percents)
#2 Catch to the side of them (all percents)
#3 Catch below them (high percents)
Depending on how you catch them you can perform different combo's.
Here are the combo's that I found:
Catch below them:
Vanish catch> f-tilt
Vanish catch> FSmash
Vanish catch> any airials and pretty much any other move you want to hit them with except Chain and Vanish
Vanish catch> needle's
Catch to the side of them (the none canceled one):
Vanish catch> dash attack/DACUS (they can DI this one more and keep you from using anything else)
Vanish catch> Needle's
Catch above them:
Vanish catch> dash attack/DACUS
Vanish catch> Needle's
Now that is if you don't catch them and auto cancel your fall. The auto canceled combo are quite impressive.
Vanish catch> needle's (forces get up)> pretty much whatever you want except for another Vanish (you can also get a chain... but you can't get a reverse lock it)
Vanish catch> chain (BTW... it jab locks) (if you stop doing the chain you also force a get up)> another chain or DACUS
ps Vanish catch stops working at 200%.