I read the thing about cheesehoarder deaggroing and it makes me nervous when he runs off for a long time but it never happened to me. I don't know if solo versus duo would differ - it shouldn't but who knows so just for informational purposes I was in a party.
http://images3.wikia.nocookie.net/ff...uins_Nyzul.jpg
When he runs away we stand right in the middle of the porter that's at the same place as the E on this map. Adds deaggro in the doorway CH has always stayed claimed and come back to us.
If you do not have +movement on pull the adds will destroy you and might also mess up something else.