User blog comment:LuxrayBlast/Possible for Shadow to be original?/@comment-7657843-20180926203353/@comment-31519587-20191016165340

I agree, a little.

Alph, The Koopalings, Arusu/ Erdrick, Eight and Solo would technically be fighters 40a, 60a (All Koopalings) and 79a (The other Heroes) as they are alternate characters, not echoes with differences.

However, Alph was originally going to be Olimar's Echo in Smash Bros for Nintendo 3DS and Wii U, if Rock Pikmin were added as an alternative to Purples. It's also confirmed information.