I fixed the issue by removing the Sistene Chapel as an example! Hopefully the point is now more clear and less controversial. Fortunately, the actual research had nothing to do with the Sistene Chapel, I was just trying to use it to get the point across--even if an artist does use apprentices, we still give the credit to the primary idea generator (the big name). Architecture is another example of this. But I stuck with the one close to my heart--science!