Daigian is just about strong enough to be AS, and I think RJ obviously put her in there to give us a clear bottom rung for Aes Sedai. And he gave us a useful comparison between her and the weakest woman we know who can channel reliably, Sorelia:



Now, my interpretation of this quote is open to discussion, but I think what this is intended to show is that Daigian sits halfway between a powerful Aes Sedai and the weakest of channelers. Cadsuane would consider a woman like Verin to be moderately strong. The presence of Sorelia makes her perspective shift, making it seem like Daigian is of that range. To me that implies that the scale would be

Sorelia + X=Daigian

Daigian + X= Verin

Verin + X= Moiraine

Based on all this, I put Sorelia at about 5, Daigian at 25 , Verin at about 45, and Moiraine at 65.

Leanne, afer being healed, was at the bottom of the heap, at less than half her former strength of 60. At half strength of 30, she would have been at a somewhat better position, and two-thirds her strength, 40, she says most Aes Sedai would have been as strong or stronger (and this makes perfect sense as the Aes Sedai mean will definitely be a bit lower than the overall mean, given how they don't have many stronger women).