They very rarely montage groups, so I have a hard time seeing any of them getting montaged. The Brothers Walker from season six, to date, are the only group to get that treatment, and I imagine that it was only because Usher eliminated them rather than advance them. No other duo or trio's been treated like that in the Battles. Not even those who got dropped there without steals.
That said, with so many this season, I agree that it's possible that we could at least see our second-ever group montaged. But I think that we should look at Battle losers or Battle winners who lose their subsequent Knockouts for the likely victims.
With those in consideration, I agree that KCK3 and the Cunningham Sisters are in the most danger of that, and The Joy Reunion, as well, unless TPTB want to feature and showcase Peedy. But given that Jim & Sasha win both their Battle and Knockout, I think that they'll avoid the montage. Girl Named Tom is probably the only group fully safe from it.
Just my two cents.