Japan might indeed be thrown a bone with Ashley if she's insanely popular there. Ridley was pretty much added because of western fan opression demand, so I am not sure if they are gonna give us ALL the ballot giants who are requested by western fans (and they seem to have data on region popularity). And am guessing these giants of western demand are King K.Rool, Geno, Isaac, Banjo-Kazooie, and probably some more I couldn't even think of. Kinda anxious what Japan has voted for honestly.. If Golden Sun did as great as it here over there, Isaac is a good contender. The removal of his AT in Smash 4 might mean he once got considered, but was decided against. The inclusions of Robin and Shulk might have got some to do with that, filling the Mage Swordsman and RPG Hero archetypes more easy and safely than Isaac.
As far as I know, Isaac was strongly supported during the Smash 4 speculation era. He ranked amongst the likes of King K.Rool and Ridley, tho both where easily more requested and we shouldn't kid ourself that they didn't. Cloud and Bayonetta probably did a little better than him in the end, but outside of the likes of cut veterans, Dixie Kong, Inkling, Geno and maybe Elma, who else is left that could garner such massive support? Toad, Waluigi and Daisy seem like contenders because they're from Mario, but that's really all I can think of.