Inkling would've definitely been included with or without the Ballot (in-fact, Sakurai has never mentioned the Ballot as a reason for their inclusion). Isabelle also seems like a character that just generally has enough popularity to get in without some fan poll.
Ken was probably also not from the Ballot; just Sakurai's pick.
For those who care, Minako Arisato is now the official name for Persona 3's FeMC (who should have been the alternate variant for Makoto Yuki's Mii Costume). Though funny enough, they list Ren & Joker separately in the Sega Heroes poll.