#3 Could have made her a valet, instead of a wrestler
The only time I can potentially imagine Liv Morgan teaming up with The Fiend is the Mixed Match Challenge. And even that would be weird because I honestly can't foresee The Fiend in a tag team environment at all.
Liv Morgan can wrestle, and hence, having her paired with a male wrestler inside the Firefly Fun House would have really made no sense. Also, honestly, her acting chops weren't extraordinary in the Riott Squad days.
It makes sense to have Lana be a part of Bobby Lashley and Rusev's storyline as a valet as acting is her strong suit while pro wrestling isn't. Liv Morgan is a pro wrestler first and an actor second, and maybe she needs to be her own character when she makes a return to television.
Andrade and Zelina Vega just seem like a pair made to be an on-screen duo. You can't say the same about Liv Morgan and Bray Wyatt, at all.