pods, err := om.podsLister.Pods(set.Namespace).List(selector)
	if err != nil {
		return err
	}
	sort.Sort(ascendingOrdinal(pods))
	for idx := 0; idx < len(pods); idx++ {
		if idx > 0 && isRunningAndReady(pods[idx]) && !isRunningAndReady(pods[idx-1]) {
			return fmt.Errorf("successor %s is Running and Ready while %s is not", pods[idx].Name, pods[idx-1].Name)
		}

		if ord := idx + getStartOrdinal(set); getOrdinal(pods[idx]) != ord {