So, I don't get it. What exactly is the origin of Xuen, Yu'lon, Chi-Ji and Niuzao ? Are they titan constructs as well, or biologically altered from something else like the dragon flights ? Or perhas the benevolent sha remains of Ysaarj ?
We know Yu'lon kinda does like the mogu and transfers her spirit into a stone statue when her own body fails, so some mogu magic may be involved here.