Nice, I think it should have more to it, but it's good that you got this covered.
Tornado is your best friend when people DI up+away your DThrow, or generally against some certain characters.
I know this enters into the "confirmed setup" section that you said was not your objective, but a lot of MK starting their road forget about this.
Now some interesting things I would like to discover:
It's possible to trap suicide people with tornado ?
I always wanted to test this, but never could. I will give a example:
You're against a Sonic (oh, the pain) or Megaman, people who recovers mainly vertically.
Your opponent is not in the percent a Dair or Bair would generate a kill as a airdodge punish so you use Nado and drag them to under the stage. They probably will need to tech because tornado have a reasonable base knockback, take some damage and will be into a awful spot to recover even if they tech. You will die, but you were up a stock.
Is this viable ? I already killed a Cloud dragging him to far from the stage with tornado, but I understand that exist a lot of moves that could achieve this same kill without killing myself, it was done to style in a friendlies.
A tornado under the stage can generate a untechable knockback if you forces MK with mashing ?
Does Tornado cancel Yoshi's mid air jump heavyarmor ?
I already canceled his armor with a footstool, but the timing with tornado would be even easier.
What happens if a recovery move beat you off the Nado ?
I mean recoveries like Coryn UpB, Fox Ilusion/Fire fox. Sometimes when you trade with a multihit move while recovering you take a giant hit stun that can kill you. This happens between Super Jump and MK's Bair for example.
Maybe Nado can stop some bothersome recoveries to gimp.
The probably best use of Tornado until now is punish airdodes, add damage after Bair->Dtilt lock, and cover ledge options.
If there's a potential to gimp dragging people away, it would be very cool.
The Nado is the MK special who travels more horizontal distance at the end (More than Drill Rush and even more than Fox Ilusion in comparison).