Thank you for your note, @JMatazzoni (WMF) :)
@Neil P. Quinn-WMF and I could put our heads together and go through the list of all the participants, and add up which personas are associated with the most respondents. However, I am not sure this would be an accurate representation of the numbers, or priorities you are asking for. What you are asking for, needs proper statistically significant research. Qualitative work like this contextual inquiry, is not statistically significant.
However, there is work that could be done, to help us better understand the numbers of people coming to various wikis, their motivations, and perhaps, how many fit under each "motivation bucket". Think of the "Why we read Wikipedia" research that @LZia (WMF) and team did about the motivations of people reading Wikipedia. @LZia (WMF) has proposed similar research for "Why we edit Wikipedia", and if that work could get done, we would be able to answer your question with more confidence.
All this said, I think we can answer the question about which persona is most important to focus on, if we think about the problems (or opportunities) we want to and are able to address (from the findings of the research), and then ask ourselves, which personas we need to focus on for that solution or opportunity.
Another thing to remember, is that while we focus on new editor experiences and needs, we also need to very closely, keep in mind the experiences and needs of experienced editors, curators, page patrollers, and all the contributors on wiki who are already working with new editors, and otherwise deal with the work that comes with more new editors. In order to keep these people in mind as we work, we have pragmatic personas, and to fill in the gaps (since those personas are "pragmatic") we will most likely reach out in various ways to ensure that our goals of retaining more new editors, will not impede or poorly impact the work of experienced contributors.