More Than Expected

You can turn this quest in, even if you have progressed to the point that Vol'jin has died, by quest synching with a fresh character (preferably a troll) who is working through the Echo Isles quests.

This is from the response to my ticket:

I am Gromnaskod, High Warlord of the Horde, and Game Master of these lands. We have been busy, fighting off the Black Dragonflight of Blackwing lair, so I appreciate your patience during the wait.

I understand that you're having trouble with the quest More Than Expected and not being able to turn it in.

This is due to the progress you have already made in the story and as a result Vol'jin is no longer there.

While it is true that the quest is not needed and can be safely abandoned if you truly must have it complete you can use the party sync feature with a low lvl troll and that way you will be in their phasing and you should be able to turn it in then.

I hope this helps you out.

Wishing you luck and hoping you have a good day.
Gromnaskod.

For anyone who cannot hand this in at a higher level.
This was the official response from a GM

Issue ID: #67654139

Your ticket has received the following response:

Heya! How is it going?
Game Master Eciaya here. Thank you so much for your patience today, mate! I hope this message finds you well. :)

If you cannot see Vol'jin on the Echo Isles (Troll starting area) - this is because your character has progressed too far in the game's story, to the point where Vol'jin is killed. You will not be able to hand the quest in due to that.
As the Echo Isles quests are not necessary for Loremaster, so you may abandon the quest to continue your adventure. :)

If you have no other questions, please help us to mark this case as resolved on this page: https://us.battle.net/support/en/case/ and fill up the following survey! We are really appreciated hearing any feedback or suggestions from you.^^

May life bestow you with epic loots and legendary journeys!
Game Master Eciaya
Blizzard Entertainment

When completed Vol'jin says: I have sometin' to show ya. It be easier to understand if ya see it yourself.

(A vision appears in front of Vol'jin)

Vision of Garrosh Hellscream says: Don't talk back to me, troll. You know who was left in charge here. Haven't you stopped to ask yourself why Thrall chose me instead of you?
Vision of Vol'jin says: Dere be no question why, Garrosh. He gave ya tha title because ya be Grom's son and because tha people be wantin' a war hero.
Vision of Vol'jin says: I tink ya be even more like ya father den ya thought, even witout da demon blood.
Vision of Garrosh Hellscream says: You are lucky that I don't gut you right here, whelp. You are foolish to think that you can speak to your Warchief in such ways.
Vision of Vol'jin says: Ya be no Warchief of mine. Ya not earned my respect and I'll not be seein' tha Horde destroyed by ya foolish thirst for war.
Vision of Garrosh Hellscream says: And what exactly do you think that you are going to do about it? Your threats are hollow. Go slink away with the rest of your kind to the slums, I will endure your filth in my throne room no longer.
Vision of Vol'jin says: I know exactly what I'll be doin' about it, son of Hellscream. I'll watch and wait as ya people slowly become aware of ya ineptitude. I'll laugh as dey grow ta despise ya as I do.
Vision of Vol'jin says: And when tha time comes dat ya failure is complete and ya "power" is meaningless, I will be dere to end ya rule swiftly and silently.
Vision of Vol'jin says: Ya will spend ya reign glancin' over ya shoulda and fearin' tha shadows, for when tha time comes and ya blood be slowly drainin' out, ya will know exactly who fired tha arrow dat pierced ya black heart.
Vision of Garrosh Hellscream says: You have sealed your fate, troll.
Vision of Garrosh Hellscream spits at Vol'jin's feet.
Vision of Vol'jin says: And you yours, "Warchief."