Ashton's breakthrough not only affected himself but also Aria as well.
Since the two of them are closely connected to each other, especially after Aria evolved into a True Spirit, they essentially became a unit.
Aria wasn't a mortal since she was a Spirit but that doesn't mean that she didn't benefit from Ashton's breakthrough.
She's not a combatant but that doesn't make her useless. If Ashton was the leader of Humanity then it is Aria that armed them. She's an artificer and a blacksmith. Any weapon that she touches automatically raises in value. Her reputation might not be as resounding as Ashton's but she's quite well-known herself.
Skylar was also affected by Ashton's breakthrough. Currently, the songbird was slumbering in his consciousness, experiencing a growth spurt due to the sudden increase in its master's strength.
Ashton has no idea how long Skylar's hibernation would be but he didn't mind. There's not much for the bird to do anyway.
