If it's not guaranteed, and better not-guaranteed options exist, you shouldn't be doing it to be honest. Besides, D-Throw > option (matchup dependent, D-Smash/Upsmash, Fair > Nair, Fair > falling up-air, Fair > Nair, Fair > Fair, Uptilt once, uptilt > jab 1+2 into mixup) > regrab > Luigi things will always net more damage, better stage control, and is guaranteed (save for the jab mixup of course). By Luigi things...
- (Fair > Fair > Regrab/Utilt)
- (Fair > Falling Updair > regrab/utilt)
- (fair > nair (hard) > react to their option (aka every single frame 3 nair used here, so shield))
- (reverse up-air > hard bair)
List goes on.
Tornado only does 9%ish total and completely ends your pressure game because it kicks up and it is a definitive combo ender. You can only really continue it if you make them fall out of it before the final hit, but there are more consistent options.
For example: you can use soft-bair > fireball instead to keep the pressure game going/get a jab reset if they miss the tech. Additionally, if it does hit, you deal 6%, so your damage is roughly the same.
Also, fireball traps with F-Throw instead (F-Throw > run forward > fireball buffer), or F-Throw > Dair near the edge, or even the same + footstool at certain percentage ranges, would be better because, if they do not jump in any of those instances, they get re-grabbed, spiked, or outright killed. And, when you have something that threatening to someone... Enjoy your free conditioning of an opponent.
There are so many good guaranteed options that you can take besides that one. Even the not-guaranteed stuff I mentioned above in my little tangent are better because they lead to more
Edit: Since F-Throw near the edge is, by far, my favorite setup...
Dair works (and leads into footstools/dair for kills), but falling off with Down-B gimps is fast enough to catch the jump option. Catch that and they just die. If they have a recovery that actually gets them back (aka not too many characters) after they lose the jump, jump > dair, or just dair, either trades and spikes, or outright spikes. In either case, you can still recover.