In most cases, Valygar will be using a weapon with a greater damage range (say, 1-8) than a Thief will be using (say, 1-6). Which means he can roll a higher number, which will then be multiplied. He's capable of getting an 8, multiplied by, e.g. 5, while a Thief can only get a 6, multiplied by 5, just based on the weapons he's able to use (& backstab with).
All the extra stuff, like the +X damage from the weapon & your/his Strength, gets added on at the end, so you're really just looking at the base damage that he can inflict vs. what a Thief can inflict, & his will generally be higher.
(naturally, there should be times when he "rolls" low, & your Thief does more damage - if he is always getting more, at equal backstab multipliers, particularly with the same weapon equipped, then it may be a bug)
- Imrahil
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