public boolean shouldSyncForCrashedMember(InternalDistributedMember id) {
    return advisee instanceof DistributedRegion
        && ((InternalRegion) advisee).shouldSyncForCrashedMember(id);
  }
determine whether a delta-gii synchronization should be performed for this lost member

@return true if a delta-gii should be performed
geode-core/src/main/java/org/apache/geode/distributed/internal/DistributionAdvisor.java