Second Rank 3 7*

I am planning on taking dazzler to rank 3 as soon as I have the resources but I’m unsure who my second rank 3 should be so I can become valiant.
This is my current 7* roster who do you think would be the best option for my second rank 3. I have a generic rank 1-2 gem also.
Appreciate any comments thank you.

This is my current 7* roster who do you think would be the best option for my second rank 3. I have a generic rank 1-2 gem also.
Appreciate any comments thank you.

2
Comments
If you're looking for defenders, Spot is good. I'd also put him as a dual threat, but he really wants sig 200 to be speedy. I'd say the same thing for Overseer, albeit I know less about his gameplay loop.
I’m more looking for someone who would be more of an attacker and someone who I could use for act 9 or other endgame quests.
All in all, these are what I'd consider when looking at what I need for upcoming act content based on your 7* roster alone. Hopefully this helps, and remember above all to rank your favorite champs, meta can come later haha.
Edit: Oh and also, Chee'ilth's awakened ability helps her somewhat in bleed immune matchups, and gives her a nice bit of utility in resisting physical burst / dot effects, but it is not at all required for her.