Hi Raymond,
Thank you - I've renamed that file in the override folder, and weirdly, I got an error message (syntax error, unexpected variable "$comment", expecting "," or ";")
I did find the missing bit at the end by comparing to the original file from the easyblog installation, however, so I stuck it into the file in the template folder, and now it all works as it should. (I cannot explain why that was missing, since I only dabbled further up, I was removing the "Guest - " tag in front of the commenter's names, as there's almost exclusively guests commenting on my blog.)
Thank you for your help, it is much appreciated!