Just came back after more than a year's absence. Had a Level 80 Dragoon but decided to boost a RDM to Level 80 to start this adventure. Google says to start Endwalker I head over to the Rising Stones but there is no quest there. My Dragoon stopped at the dock where I would have started 'The Grand Adventure' accessing The Grand Cosmos. Even though I boosted to Level 80 do I still need to complete 'The Grand Adventure' before Alphinaud appears in the Rising Stones?