personally i dont believe in pinning down any particular element to what is already established, for the most part. if the creature is firmly entrenched in the theme of an element but the corresponding ability is already associated with another element, in my opinion it is OK for the creature to stay in that element. if the ability doesnt really meld that well with the creature and the ability doesnt mesh with the element, that is when a elemental switch may be in order. but when the ability fits with the creature and the creature fits with the element, I would not worry about the ability not fitting the element it is in as it currently stands.
My comments were more about how the flavor fit either other or Darkness and the effect was Darkness. Therefore I feel that it would work better as a Darkness creature. I have been convinced that it would also work as an other creature.
In order from most optimal to least optimal IMO
1) Creature fits with Skill, Creature fits with Element and Skill fits with Element
2) Creature fits with Skill and Creature fits with Element
3) Creature fits with Skill and Skill fits with Element
4) Creature fits with Element and Skill fits with Element
5) Creature fits with Skill
6) Creature fits with Element
7) Skill fits with Element
8 ) None fit
I think only 1 and 2 are good design with 1 being preferred over 2 if possible.
3 should be changed to the Creature's element
4 should be made into 2 cards
5 should be moved to a better element (based on the creature optimally)
6 should change its skill
7 should change the flavor of the creature
8 should be abandoned