User blog comment:UPL2229/Tassadar in Legacy of the Void/@comment-31277203-20190127182756

You don't have to bring Tassadar back. Blizzard specifically said at the time of WoL, the only reason they brought him back was he was the only one who could have convinced Zeratul the Overmind wasn't what he thought it was. But they kept it vague in the event they could come up with another reason for why Tassadar showed up. His appearance by the LotV prologue already began to convince people that it might not have been him at all, but rather someone disguised as him.