I mean, I had kind of just assumed that considering his Female Vrykul form and the fact that she splatted herself against Saronite that it was Yogg-Saron. Frankly, the only thing that surprised me about the Jailor … was that it was a new character. That role was always a theoretical in my mind after seeing that deal. Which always came off as far, FAR too good to be true given the circumstances it was made. I get that she is the Queen of Plot Convenience more often than not, but given that entire scenario … that was stretching it. Even for Sylvanas. Since they gave up SO MUCH bargaining power for what equates to (if the deal is as it appears) “not being enslaved by Bolvar, so they could get enslavement AND permanent torment/soul death for Sylvanas”?
Not to mention, these beings are Timeless. Considering Sylvie’s rate of going through them, and her walking to the beat of their drum at least (since they have to be the ones that got her in touch with Helya) … I doubt they cared about a few years? She croaks, they go home. She does what they want, they return to their master fulfilled.