User blog comment:Mich, Michele & Kuhla/Future Units Preview/@comment-27691408-20160406192744/@comment-2061246-20160407042703

Zeruiah, Ravenna, and Randolph are already ridiculously OP as they are now. Zeruiah now being the largest drop rate buffer, Ravenna being the largest nuker, and Randolph having the largest leader skill bonuses. And considering they're limited units, gi ving them Omni Evolutions  would be unfair to players that haven't had the chance to receive them yet.