Just finished the Avalon mission with a buddy. He was fire team leader. I’m 1801 and had the node mission on my map. We went to the gultch and we both collected the nodes and we both went into the cave. We both completed the mission in one run, we never went back to orbit. At the end, I got all the achievements that popped up for killing the final boss, and I collected “the variable” at the end. My fireteam leader didn’t pick up the variable since I had. Mission updates to take us back to war table to finalize it. Vexcalibur dropped for him…but nothing happened for me.