Yes, exactly. Sum of pageviews on TW, sum of pageviews on Wikipedia, and total number of rows.
It would be hard for me to mentally sum up dozens of rows even after the sorting capability is added. It's hard for me to sum up more than 3-4 numbers by eyeballing. I'm guessing others will have similar limitations.
@riceissa Great question! How hard would it be to break out number of views to which that person was the sole principal contributor, and number of views for which that person was one of multiple principal contributors? From this level of broken-out data, we should be able to recover both the summary views you mentioned.