Re: (Nutaku) Milenium War Aigis (English Version)
Those are his level 70 stats, Larcx.
The lower the rarity of the unit the faster they tend to recoup their stats, which makes sense, but there are a number of exceptions and the full benefits of AW(beyond new art, a new ability and new traits) vary from unit to unit.
Healers tend to gain less attack out of AW than most other units with comparable attack. A perfect example is Black Iris and Liana, who barely gain over 50 attack from level 80 cc to 99 aw. Gold and plat healers actually gain more out of their AW leveling(not all that unusual for this to happen, to be fair), but it's still pretty small compared to others.
Summoners do not lose attack on AW. In exchange, their cost increases.
Rakshasa, demon princess(won't be on Nutaku for a long time) does not fully recoup her stats till she's in the 60's.
There's other eccentricities in stats. Just giving a few examples so that people keep in mind not everything is predictable.