The Undertaker recently revealed that there wasn’t ever discussion about adding Kane to the Ministry Of Darkness. The WWE Hall of Famer spoke during a Patreon Q&A about the group and talked about the 1999 faction, and you can see some highlights below (per Fightful):
On Mabel joining the group as Viscera: “[jokingly] I put Mabel in there so I made sure I didn’t have to work with him. That’s when Mabel became Viscera. Ron and John became The Acolytes.”
On Kane not going the stable: “I don’t ever remember Kane coming up in that. It’s funny, I don’t remember where we were at in our story at that point. I think Kane was actually in a pretty good run, his singles run about that time, too. So I don’t think I don’t think he was ever really considered.”