although it sounds like the individual days are more like IV, IV, IV, overall this sounds like it should get a VI - as a two-bivy route it qualifies. The difference between this and the Ptarmigan Traverse is that this route actually follows a continuous ridgeline whereas the Ptarmigan Trav. is just mountaineering with side tours to summits, not continuous climbing
Likewise if you did the traverse of Vasiliki Ride and then hiked across the valley and traversed the Lib Bell Group that would be linking two III/IV ridges but b/c of the hike in between it wouldn't be a Grade V.