If you read up the rest of the post you will see that I was commenting on the case of Greg Land, who actually traces work by his own choice and making a distinction. This never happened by accident the editors and directors picked up those scenes as filles and set them up to be recreated and reused.
I dont understand why you would doubt they were rotoscopes to begin with, considering the heavy usage of rotoscopes that disney had. They were known for bringing girls in to pose for the artists and recreate the scenes they were working and have actors setting up scenes to be drawn over.
They were also known for reusing them to reduce costs as filler in later movies when needed.
