YEah, Crucial Knee Jam is the left arete of the buttress from that notch, i assume it traverses the break from the slopers along right which is about 5b, (past the thigh of the guy climbing) and the bit of "arete, dyno and finish is a bit vauge.
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The crack it finishes up is invisible on that photo but is in line with the arrow above, between the spotter and the obvious wide crack/arete.