Well, there’s a huge fan demand for him, Sakurai seems to have an affinity for the character himself, going so far as to think about including him since Brawl, and giving him a Mii Costume in Smash 4. Geno also garnered a lot of votes during the days of the Ballot, and though we don’t know the true Ballot results, many online ballots had Geno as high ranking, and that spans across the West, Europe, and Japan.
With Square and Nintendo being on such great terms with each other, it wouldn’t surprise me to see Geno actually make it on to the roster this time. I mean, this is supposed to be the ultimate Smash Bros game after all.
All this vs. A character from a popular franchise, and even one Sakurai reveres, but has only seen a large fan outcry in the recent months due to a purposed leak of his inclusion. I know fan demand existed for him before the leak, but nowhere near the same outcry as for Geno.
I’m not saying Simon won’t be in either. He could be for all I know, and Geno be relegated to a costume again.
I’m not a supporter of either character. Their inclusion or exclusion is whatever to me.
I’m just going off observation.