I dunno, they came together to eliminate Orochi before his soul was reborn at the end of XIV, but everything else is unrelated to them, it's not their job to handle other revived people. I don't see a reason for them to team up until after Ash or the Orochi gang actually do shit, which they might do in XV, meaning they'll team up in XVI.
The only problem with that is I don't know who Kyo will team up with if not Benimaru. Iori and Chizuru have options, Kyo is the only one who doesn't have any friends other than Beni, Goro, and Shingo.
If I struggled to the end of my determination, to the end of my way of life with my followers, if the result is ruin, then this ruin is inevitable. Grieve. Shed tears. But you cannot regret.