Maybe just a common sense but I don't think this is working as Blizzard intended.
Ever wanted a Monster Slayer's Kit - Item - World of Warcraft ?
Got sit out of KZ raid?
Cannot find the group for your alt?
This quest require you to take the item in boss room.
Normally if you want an item from raid you can just comes and get raid ID from the group that already done, but Blizzard doesn't seem to want you to do that for this quest. The boss room door will be locked after the boss died for a while so nobody else can come and use raid ID to pick up the quest.
But there a way to counter this, leave Warlock and 2 other people INSIDE the boss room. From this point on, you all know what to do
No more problem for your alt that can't find the group, you can even try to sell the summon to the boss room for people who got the problem getting it too.
Tenris Mirkblood won't be there forever so gotta hurry
I'm not sure that Rogue can open the locked door or not because I don't have a Rogue to test it out but I think that if Blizzard would bother locked the door they would made LP required for that door more than 365.