We had some trouble with the selected display name not showing up correctly in comments. It worked fine in themes which displayed post and page authors but comments was often incorrect. That wasn’t good from a user experience perspective and also concerned me a bit in terms of what students might expect to be showing vs what actually was showing. A bit of Google-ing prior to trying to write it from scratch led me to this post which I was able to add to a network activated plugin and be done with the issue. I tend to link in the source of stuff I used to solve the problem1 in the plugin. That gives me an embedded reference/footnote in case I ever need to revisit it and it provides a kind of credit as well. Good for me. Possibly even good for the author of the fix. Having a plugin network activated for fixes of this type is also handy. It keeps the plugin numbers down and ends up being a single place for adding/removing/troubleshooting random custom functions like this. 1 Harvard may not agree.