I’m pretty close to the same spot. Desperately wanting Panther; my only purple 5* is Okaban, and is like better. Also really hoping to get Gregorion at the same time; similar with Kadilen.
And I’m delighted with Alasie, but waiting on scopes. Thorne isn’t going to give me a hard choice.
And as for yellow 5*s, having just ascended Delilah, and zero regrets, I’ll probably go with Justice when I’ve got the mats, but would go with Joon or Guinevere ahead of her.
Somebody mentioned how AoE take out Del’s minions; true…but that to my mind is exactly why I want them. Minions are meat shields that also attack with little pinpricks 
When I was struggling to finish rare quests, she was a huge help to me that way; I would build up nearly a full set of 3x150hp in front of everybody during the mob levels and last a lot longer against the bosses. They wouldn’t last long but it was a huge head start.
Perhaps I will really need and want her as my third yellow 5* …