Can anyone confirm that quest starters do in fact drop from grey MOBs? I saw a reference somewhere, can't remember whether it was these forums or the wiki that said they do.
Mob color doesn't matter. In any case, I don’t remember that met exceptions to this (let us say, if make lore and legends on gray, it happens that items drop out to start a quest, approximately corresponding to level of processed mobs)
Only thing - is that at same time you can kill more gray mobs than green or blue mobs. Accordingly, chances of getting more at same time are higher, if of course we are talking about falling out same quest items as from blue or green mobs. Don't ask more about it
Nearly all gray mobs drop quest starters. There are a few restrictions, which you can find on the wikia for that particular zone/timeline.
Yes, grey mobs drop a small chest with the queststarters. For many years. But the drop-chance is higher with colored mobs.