I asked my friend to send me Jin's dialogues but he's busy and only gave me a bit.
The speaker is Tenebris.

As for my take on Amad
I still think he's evil. If you get to the lv56 quest at ep4 you see him at the end of the dungeon. There he reveals that he had some plan to make you fall. He confessed that he made the copy of your character out of greed energy (I assume that's the voice your character keeps hearing in the dungeons). The voice also also said "sorry, Kant. I wasted this chance." (Erwin's perspective)
Interestingly, Kent proceeds to say "everything could have gone smoothly if it without that woman." (Referring to Rosca, I'm assuming.) He continues, "So, come along. I'll prepare everything so you can get started."
>character voices confusion here...
Amad continues, "Don't you remember? I'll be happy to toss you a bit of human as prey to help you get acclimated."
(And we know the Sinworkers were murdering humans in droves so that's where he's going with offering human prey...)
So, I think he has evil intentions...possibly trying to bring destruction to the outside world much like how Sinworkers wreck havoc in the void. To do so he needs evil people with power like the sinworkers.
Yet, we don't see any bad Soulworkers/soulforcers in the real world, only in the void. The aforementioned point was brought up by Tenebris. Folowing this, I'd assume Kent/amad would have to make some for his plan.
Again, that's just my conjecture. I think there also might be a greater evil above Amad as well.
