Cmon, Demandred? He hasn't done anything! Damn we haven't even barely seen him channel at all. He doesn't kill anyone or anything at least Slayer kills people and wolves. He is a very high ranking DF just below Forsaken who has been around longer than even they have since they just recently escaped the Bore. He is probably privy to a few secrets concerning wolves that the Forsaken don't even know about.

When did he run away from Perrin? Oh yeah, he only did that when he was wounded and needed medical attention. What a damn coward he is.

As for being Cannon Fodder why isn't he already dead then? Lets see.
1. He can escape any confinement.
2. He can get healed either the traditional way from an arrow to the chest or he can go to a Forsaken or other Black ajah for Healing.
3. He might command Dark Hounds.
4. He is the highest ranking Dark Friend outside of the Forsaken we know of.
5. He can look like 2 completely different people at will
6. He can enter TAR in the flesh
7. He is a trained asassin.
8. He can easily kill Aes Sedai as we have seen him do in the past.

This Cannon Fodder sure has alot of abilities and training. Lets not forget that antagonizing Perrin usually been a horrible idea for anyone who has tried to get the better of Perrin. Those who do usually end up dead at the end of Perrin's axe or a TR arrow. He is viscious with his enemies and yet Slayer survived his earlier encounter with Perrin.