[Morgeruat]

Well, without factoring in extra damage from critical hits then that's about right, assuming he only has * in long sword, I strongly suggest that you equip him with a 2-handed sword, which he should be specialized in, and unless your main character is a paladin, give him Carsomyr, easily obtainable at your level, altho if you don't have it yet you'll have to wait till chapter 6.

what I did, since he's already specialized in 2-handed sword, is put his prof's into 2 handed fighting style (not to be confused with 2 weapon), it lowers the weapon speed, and increases his chances of critical hits