#2 Sienna

Sienna has been in the wrestling business for quite some time, and has starred in promotions like Impact and Shimmer, as well as appearing in the second Mae Young Classic, so it's odd that she finds herself not tied down to a full-time contract.
The former Knockouts Champion possesses a unique look and fantastic in-ring work, but it's her character work and storytelling that makes her a star, and AEW would be wise to bring her in.
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Not only is she known by the wrestling world, but she would be a great veteran presence in the locker room, and they should not only bring her in for All Out, but she should be signed to a long contract.
It looks like the NWA is making a play at a weekly program as well, and as Sienna is heavily linked to them, that may make this situation a bit murky, but if AEW want the strongest women's division possible, she is a fantastic choice.