That's a fair guess. But Shin Yokai is already an Ally from Redemption 1 and most of redemption 1s allies were minions of the relevant boss. That would work for Yokai, Tlaz, and Mack in redemption 2, but all the minions of the KS2 bosses are already allies. So, yes it's likely well see a few of those bosses as allies, but we could also see some of the remaining minions become allies.
It's very likely this isn't a detail they're going to bother releasing in an update, so we probably won't know for sure until the expansion arrives.
It's very likely this isn't a detail they're going to bother releasing in an update, so we probably won't know for sure until the expansion arrives.