It's kinda unnecessary if you're going to have him as a character like that. Either give him an original moveset is he's gonna be a character, or keep him as an alt. The only difference between Pittoo and Pit are their voices and color, that's it. There's no height difference like with Marth and Lucina, and even though it would buff up the roster, it feels jarring to see two characters who look EXACTLY like each other, save for color, on the selection screen.
Eh, well I haven't played uprising but maybe they could give him some other weapons and make him more powerful but slightly slower or something. Yeah, he does look like Pit (he's literally a clone I think?) but I think he was ganna be an alt and then they decided to give him the same treatment Lucina got at the same time as her, if not before. I'm pretty sure his appearance at the end of Palutena's trailer and her special art signify his role as a secret newcomer. Yeah, it'd be jarring to see him and Pit since they look alike, but besides looks it'd be the same thing as Fox/Falco or Marth/Lucina.
I'm not saying I want it to happen, I'm kinda neutral either way, I barely know Dark Pit, I just think the more the merrier and there's some interesting evidence making a strong case for his inclusion. Besides his fans'll love it and his different voice clips, win poses, and trophy description will... be cool. I dunno, I wanted to mention that for some reason? Whatever, I'm kinda tired and don't know how to end this.
Pic of the day wednesday, uuummm maybe a vet with that music update hopefully, or maybe... I dunno, we got assist trophy, alts, and a stage very recently this week. Item? Maybe what that chest does? Maybe a Pokeball Poke?