I'm having the same issue. I brought him both parts at the graveyard and now he just tells me to wait a while, but I've done everything else in reapers coast so nothing will trigger him to go back.

Edit: Just wanted to add that Gareth isn't back on the boat either, even though I completed his quests as well.

Last edited by Thekipz; 07/10/17 03:37 PM.