Sturm is correct. Ledah's stats only change when you use the mana wisp in chapter 1.
In my opinion, I really dislike using Cierra's and Lina's Overskills because they hit random enemies, although that can be considered a plus, I prefer attacks which I can control. Serene Almight/Absolute is such an example which hits the ENTIRE front row which is great for regular battles.
However, boss battles usually only contain the single target which makes Lina and Cierra godly especially when using the right items. (Lina using Iria's Bow Overskill against Arch Angel comes to mind)
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