I also actually agree that Impa doesn't need any BOTW shoehorned into her moveset. But hey, it's the Sheikah Slate after all. It's infused with Sheikah Magic, and Impa is still the Sheikah's leader in BOTW, she's the most prominent Sheikah in the franchise. So it's not really farfetched for her to use a few abilities from the Slate, without using it herself.
I do not think this is the sole potential Impa has, or the only merrit of her getting in. It just helps differenciate her moveset a little. Then again, it should also fit with the whole playstyle of course. I agree that moves shouldn't be planned before a general playstyle is envisioned, but in some cases it helps. Take Donkey Kong's dash attack for example... Please marinate deeply on the horrible dorky and awkward looking dash attack that DK had in all the previous Smash titles before Smash 4.
Creative liberty is sometimes a great thing. I wouldn't be upset at all if Impa got a moveset that's totally made up, much like Sheik. However, what sets Impa apart from Sheik is that she has a few moves of her own that could be used. Since Zelda was trained to be a Sheikah- thus Sheik- in OOT by Impa, it makes a 100% sense for Impa to fight similar. However that was not the point now.
Hyrule Warriors Impa is fastly unique and has enough abilities to make a playable character. In general, I think this game has the best potential to influence Smash Bros. moveset. Not in chances, but in terms of what is has to offer for the main cast we've had since Melee. Link is a whole lot faster and does some impressive stuff, Zelda has her rapier again that gives her some spacing options
potentially, and Ganondorf could be a twin blade user, with of course a WW Ganondorf alt because that's just too awesome..
I mean, just seriously give me this and I won't even care if Impa is not in. Then again, if one Hyrule Warriors character gets in, there's room for another right?
This is what I said in that long ass post of last page on this issue (great that it was completely ignored btw you guys!) ; I hope for a lot of alternative costumes for the Zelda cast based on elder character designs. Ocarina of Time deserves a costume for every character, Twilight Princess would be cool, Hyrule Warriors maybe, and BOTW for Link and Zelda. Young Link and Toon Link sharing a slot and thus become each other's alts is also great, because this leaves room for different Link designs as well.
Why I think this might happen? BOTW and HW both emphasise a lot on exactly this. Hyrule Warriors more so yes, but that's more obvious anyway. The fact that all the old costumes return in BOTW is also a great sign for this. Also there's amiibo of OOT Link and the like.
Zelda has the same boring cast as in Melee, but add a few costumes of technically different characters and Zelda nerds will love it. It earned the devs of BOTW a lot of money, so why not do the same for Smash? Then differenciate a few disfunctional Zelda character's movesets like the 2 Zelda character constantly in Bottom Tier since their Twilight Princess designs for example...
So yeah about Impa, no need for shoehorning BOTW stuff in her moveset if she'd get in, but since most of you won't speak of Zelda unless it's about Breath of the Wild and the general idea of a BOTW is having a third Link in, I felt the need to adress this horrible idea. Then again, having Impa with shoehorning abilities is also terrble, but long not as terrible as 'Wild Link'. They finally managed to NOT have a horrible version of Link in Smash 4, he's literally the best he's been since NTSC Melee Link and you folks would change that? No please.....
Odyssey Mario is also a terrible idea. But I'd like the notion of Samus being changed up to reflect how she plays in Samus Returns, cause y'know, I can see that stuff returning in future games. Cap throwing Mario and weapon durabilty gimmicks Link who carries a magical tablet around just don't do that much for me.