Is that top runner in for the Sentinel? Surely a bit of a side runner? Can see why you'd want it, the gear in the vertical crack is sub-ideal.

looks like your getting some serious rope drag!

I think you got up that top section rather smoothly myself.
And yet another of my photos gets a 4. :)

Learned comments noted. As God (well Coel) is my witness I did not stray onto neighbouring lines (i.e Sentinel Crack Rt wards) at any stage (low or high)and that nut out right is Pish with a capital P. I placed the worse than useless nut from the shelf where you see the cam on the Rt rope before stepping back along the same shelf to tackle the front face of the arete head on. Rope drag was none too bad, surprisingly.