So a group that changes members is not the same band no more? And you are in the Destiny's Child thread saying this?
Jacksons ans J5 were literally marketed as different groups.
Is LSG the same as New edition because it features Johnny Gill?
Destiny Child never changed the lead singer and always kept the same branding thus its the same group. Now if Beyonce left and Aaliyah became the lead singer and they kept the same name then youd have to judge them by the era. Similar to the temptations.