It’s like Destiny’s Child. Their break-out album was recorded by 4 girls, but months later two of them left / were removed from the line-up and replaced by 2 new singers alongside Beyoncé and Kelly, of who another couple months only Michelle stayed to form a trio.
Anyways, Michelle spent the a long time appearing in music videos “singing” songs that weren’t her voice recordings and ofc. performing live the songs of the first two albums she originally wasn’t part of.
Same thing here: The blonde went black and became a controversial figure, so a replacement blonde was found to take on the promotion duties.