Joe Carter is in the top 3 and definitely in the top 9 of every list I've ever seen put out so it would make sense for him to be in a memorabilia piece with 9 cards:
https://www.ranker.com/list/best-toronto-blue-jays-of-all-time/ranker-baseball
https://www.sportsnet.ca/baseball/mlb/revealing-sportsnets-greatest-blue-jays-top-20/
https://www.sportsbreak.com/mlb/the-15-greatest-toronto-blue-jays-of-all-time/