kafka-consumer-groups.sh delete group with new-consumer

[yuanjia8...@163.com]

Hi all，
    When I use kafka-consumer-groups.sh to delete new-consumer's group, the 
shell note that "Option [delete] is not valid with [new-consumer]. Note that 
there's no need to delete group metadata for the new consumer as it is 
automatically deleted when the last member leaves."
    How to understand it is automatically deleted when the last member leaves? 
    Does it means the consumer's position could lost if the consumer stop?
    

Thanks and Regards 



YuanjiaLi