In a certain situation, Dehaka can have some of his skills vanish and be inaccessible for the rest of the game.
That situation is when Dehaka is on his second prestige, a primal pack leader is active, and you assign either the detection or +3 armor skills. (I do not know if it applies to other skills or not).
Steps to reproduce:
- Choose Dehaka as a commander
- Choose Primal Contender as the prestiege
- Get to level 5
- Summon a primal pack leader
- Press F3 to select Dehaka while he is out of the game
- Select the detection and/or +3 armor skills.
- Unsummon the primal pack leader.
You now have a Dehaka that will never be a detector nor will he have +3 armor.

