From a branding standpoint, most teams/schools use a initial taken from the location and not nickname. Oregon (O), Nebraska (N), Green Bay (G), etc, etc. Honestly I think if any school were to break the rule it could be us. The Z is so unique that it really can't be confused with any other school. The ARoo is fine but I've also had people call it a horse or donkey. The problem is consistency. Keep the same logo so it becomes iconic. Way too many schools have fallen into the trap of switching helmets every season. Having a different logo on it every season doesn't help build a brand.