So Cauldron appears to not realize Sunset's true origins, which probably might be a good thing everything considered. Though it's possible that Rebecca was just lying to Legend in regards to Sunset's believed origins.

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They aren't omniscent. They can't knew everything.

This is clearly Contessa's OP Path to Victory power at work.

It must have told her that defeating Scion would be easier if they moved the statue.

Of course Contessa's power doesn't give explanations.