I don’t see what version of Notes you are on. Unless there is a new function for this in R7 or R8 that I do not know, there is no way to do this with your existing design. You will need to add a form to lookup and calculate the cumulative scores, then use that form to provide the view that will sort the cumulative scores of the authors highest to lowest. You will also need a scheduled agent to update these values on a regular basis, and create a document when someone new starts getting scores on the system.
I’ve create summary forms like this on a few occassions.
However, I would also review your other reporting needs to determine whether you should be developing a reporting tool to compliment the Notes application(s), then include this report in that system, instead of trying to build this reporting function into Notes.