Apparently two members of UNB and one member of Uni.T were supposed to debut, but there was an "error" that changed the contestants' score and somebody else made the final lineup. There was an error when tallying the results during the finale. This is what KBS said "This was a simple error that occurred in a situation where only three of the 10 internal producers were doing all the work because of a general strike at KBS that was happening during the production and broadcast of the final episode. There was no intention to favor specific contestants over others"
Not them trying to downplay this. You can claim this was a mistake, but come on now. That just means the producers weren't doing their job properly, which is just as bad as rigging tbh.
I'm 99% sure these are the members who I think were potentially rigged out
Timoteo (Hotshot)
As for the girl group member, it was either.
Semmi (Matilda)
Euna Kim (The Ark)
I think it was probably Semmi because she dropped from 2nd place to 12th for no reason. She was a fan favorite throughout the entire season. With Euna Kim, I can see the fan vote being split between her and Suji.
So annoying. The Unit was such a good idea but it had such lazy and horrible execution.