In reply to Ajm265.

Tocha and Kandi were the strongest vocalists of Xscape, while Tiny had the baby voice. Your analogy doesn't work because Tiny or Tamika would of had the least vocal ability out of the girls - and in fact even then I'm reaching, because all of the girls in Xscape can sing their lil booties off, and the same can't be said for the Spice Girls.
* Peep Kandi's run on this,
https://youtu.be/iDHggk9NlN8?t=2m40s