Pretty much what the title says. It starts, prompts me to go to Driftshade with Vilkas but Vilkas doesnt come with me. He stands there and just says we must go. So i did, alone, grab the fragments and come back to jorvaskr and Vilkas doesnt acknowledge i finished the quest. Well he does kinda, he says "we need to return to jorvaskr" while he's standing in jorvaskr lol.

I've tried installing USKP patch but he still doesnt move. I've tried the commands setstage c05 0 but that just resets the dead guys in jorvaskr. Its not thzt i cant start the quest, it starts but Vilkas doesnt follow and wont complete the quest when i return with the fragments...

Help!

Try loading a previous save from before you started the quest.