Worldwide, Vicki is number 84, but she is the only all 70cms MG that I know of for sure. I don't think anyone has yet asked for an MG award as all 70cms.
pos call summits points bonus total average
84 M6BWA 677 1697 552 2249 3.32
Finding out exactly how many points someone has earned using only a specific band or mode is not straightforward. Well it is straightforward, but the database wont tell you that directly. So if you select 70cms the answer you get is not the number of points earned via 70cms activations but the number of points earned where at least 1 QSO was on 70cms, which is something very different.