Based on tone/styles then actually yeah I can see what you mean, I thought you were talking more on quality in their performances.
Although I think Lauren can show some powerful vocals if she wanted to, she just chose not to(but if it didn't happen on the show, then I guess the casual viewer wouldn't know)
girl i know you're just saying this because you like Karen and Lauren so you want them to go together 😭 just think critically !! Karen and Brennley both do powerhouse country and Lauren / Zoe both have a more understated style
but also my most important point is that Lauren and Brennley FAR outclass Zoe and Karen