I'm playing water main control and I've been abusing the free GNW Neji to acupuncture turn 1 and every combo. However, I'm about to reach level 69 so I'm looking forward to Sage treasure, with 50 scrolls saved up I'm thinking of getting Ao. Ao can simply replace neji for me, I just need to swap my summon?

Is it worth it? Is Ao a big upgrade from GNW neji or should I save my seal scrolls for something else?