It still doesn't make sense.
Wario has his style due to WarioWare (which Waluigi is not in as of yet), and plenty of his moves work towards his body type, which is in stark contrast to Waluigi's. I mean, other than Whirluigi being like Corkscrew, you really have to stretch to make it work to where it makes sense.
As for Waluigi copying Luigi, where is the logic in that if Wario has nothing in common to Mario in Brawl?
At least with my suggestion for Impa, it isn't unreasonable to see her performing Sheik's acrobatic attacks, and a few tweaked versions (i.e. using dark magic due to being the Sage of Darkness in OoT) of Zelda's magic-based attacks.
And I even said that her Specials could be her own, rather than taking from Sheilda there.
EDIT: The only way having a Luigified Wario would make sense if is Sakurai decided to screw the rules and add Waluigi as an honorary WarioWare character with an original design, but even then, quite a few moves would have to be changed to accommodate his body frame, as well as replacing the farts, hot dog chomping, possibly the bike (if he doesn't make Waluigi a biker), and the superhero thing. But then you got a case like Jigglypuff where there is a few similarities to another character, but not enough to label them as even a semi-clone.