Alright, so i don't want to be the one to rain on everyone's parade. But after some testing, I've concluded that it's cool, but not practical. It works great on a standing computer, but when I put my lil brother on control during training my hopes for it was kinda crushed.
It can be escaped in two places. First, he could jump out after the u-tilt sometimes depending on his timing. Second, after the footstool, he could effortlessly roll to the left or right no matter how fast i tried to nair him. The stun from the footstool doesn't seem to be long enough.
It is neat and it is still sort of possible in a real match, but the opponent could rely entirely on instinct to avoid it.
I'm still hoping i'm doing something wrong though... :x
Ur Nair is not fast enough, i had my brother do the same thing and with perfect timing he could only escape the uptilt by jumping. Snake any character can cancel the footstool jump by using an extremely fast aerial but the timing for this is so hard its almost impossible as long as u do the combo correctly. For example, have ur brother play Snake and then do this combo
Downgrab
(Spam)Uptilt once u start the uptilt animation spam short hop
Short hop: here is the tricky part, u have to do this fast and have excellent aim
Toadstool: Dont miss and dont jump again after the toadstool
Nair then fastfall thats a big trick to this. U have to fastfall as soon as u can, to get down intime for it to hit or else ur opponent will role away.
Dtilt
Jab Lock
I understand its very hard to do but i wouldnt post it on the boards if it didn't work.
For character like MK u can do this Fthrow, Uair, Utilt, jump, toadstool, Nair, Dtilt, Jab Lock
Its been tested and again the only opportunity for escape is if u dont utilize all the stun time from each attack. If u dont utilize all the stun time ur opponent will be able to escape with a well timed Jump