Your list is kinda bad, because everyone but Brand and Ahri, and possibly Miss Fortune, need more work than VO's. New VOs should be focused on champions like Lissandra, Sivir, Lulu, Trundle, Zyra, etc, as in, champs released or VGU'd in the past 4-5 years that have all the valid animations and updated models/rigging they need to be modern, but lack all of the interactive voice lines like item purchases, warding, kills, pentas, etc. Your list is composed of a ton of old champions that need too much work, and a VO would just be overwritten when they get the VGU they need.