Due to my peculiar collecting habits, I would only consider the sets 'done' if all the singles OR all the panels were collected - I never did mix and match. However, if I had all of both, then it's a true master set!
Did you ever buy the Drake's Cakes (or any associated product) just for the card panels and toss the rest?
Please visit my YouTube channel 'The Vintage Composer' for more info on sports card collecting, sports history, trivia, and more!
https://www.youtube.com/channel/UCPoAYGOXYlY9OBIZPKqsCgA/videos