That is honestly not a very bad siggestion and I agree with everything you've written. I want to approve this suggestion for this wiki. It will help with organizing the medal list much easier and better.
Anyway, I found out that there's a lot of duplicate Yo-kai Medal images, so it will takes time to clean up. Since I'm just a normal contributor here on Yo-kai Watch Wiki, this job must be done by any of the wiki admins.
The image size of each Yo-kai Medal image is inconsistent and some of them might be too large for the list tables, so I'll say they should be resized to the image size of 147px x 147px (Which is the image size of most medal images on the Yo-kai Medaland websites) and must not have the empty space between the image border and the medal.
Alright. I have various projects in my head that I want to execute, but removing images that are not in use on this wiki and articles as well are part of a clean-up. So, in a matter of time, I will remove the duplicate images of the medals. Furthermore, fine by me.
Although I wanted to create sub-articles for the Yo-kai Medals article on my own, I can't since I don't know what the other admins will think about it. Furthermore, as I mentioned, I'm just a normal contributor, so I can't rename the image files of the Yo-kai medals.