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It is possible that some NPCs scale to very high levels. J'zargo (the companion) is rumored to level up with you until 81 at least and I see no reason why this couldn't be the case with other NPCs too. As always though no accurate answers from me :).
How to Kill Krosis in Skyrim. Krosis at Shearpoint can be quite the bi*ch. His fireballs are retardedly strong and his summons can kind of make babies cry. My tips to kill Krosis is to first kill the dragon who resides there first. Make sure you take him out without moving too close to Krosis' tomb. After you eliminate the dragon close to Krosis trigger his release and run to one of the nearby rocks. From there start the fight normally and hide behind the rock.