I can't tell if they are seperate characters or the shadows of Haken and the other High Ones. If they are seperate characters it's just bizzare that they didn't try to contact the others since they were close enough to see and hear them!!
It's other High Ones, but further back in the cave. They're likely fully aware that the surviving of the Nine are there. They're just busy tending to their wounds, talking to the person they're sitting next to, helping others who are more hurt then themselves. Lots of them could be in shock over the killings and didn't talk to anybody.
You basically have to regard them as unimportent characters. They have no role to play in this story whatsoever. They are show as shadows, just to show the humans didn't kill of every body. Timmain's group is the focus because they are the ones that started the Wolfriders.