Why is सिंडरेला (usually) the 'leader' या standing in the center of the DP:s? Snow White (1937) is the most classic one, right?

Because सिंडरेला is a चोटी, शीर्ष merchandise seller right अगला to Ariel and rapunzel...the kids प्यार her और than snow

I think it's because Walt Disney's प्रिय princess was Cinderella.

I think because she was Walt's प्रिय and she's popular.

I think it's also because सिंडरेला is और iconic than Snow White (even though both are). And और marketable.

Maybe it's because she's been the most लोकप्रिय princess for a long time- she's pretty much the आइकन of डिज़्नी alongside Mickey and Tinkerbell.