In my experience, Kraag 4 is much easier for a solo warrior than Hauntlet so I think you'll do better there. Plus I enjoy running it - you get pull large groups of mobs together and then beat them dead.

If you see a sorc/rogue close to your level in Kraag 4, you can always throw them a party invite as well to see if they'll join you. I personally prefer not running with another warrior in Kraag because it seems to slow things down.

I don't have Loki on my warrior so I can't tell you how he compares to Ethyl. I recently bought Wyatt but haven't leveled him enough to make a valid comparison yet. There are a lot of posts in the warrior forum on best pets so I'd recommend you do a search through those before you buy any more. My point was that you don't need an expensive/uber pet to be able to effectively run Kraag 4. Loki is likely fine for that purpose.