Pitch 6 takes you to the summit of the tower. Normally, you can walk off from the top of pitch 5, or climb this last pitch and summit a small tower with incredible views over Black. There are rap anchors to rappel down from this last pitch back towards the walk off trail. It is definitively worth doing it.
I climbed this twice using this leaning wide crack to the summit. There are possibly face climbing options with not much protection.