I look at the key personalities and they were all the go-to players on their high school teams. Azzi, Carol, Sarah, KK, Ash, Ayanna, and even Morgan, Ice, Jana and Allie That's a type Geno looks for. They may or may not have the best skills, but they know how to build chemistry and to rally around one another.
Ash in particular seems like a prototype for this. Watch her high school games on YouTube and you see this trait in shining colors.
This isn't the same thing as chemistry, but it is an important precursor to it, and Geno has found a bunch of kids like this.