If they MUST have Draka back & Thrall is involved then for fucks sake don't do WoD, have them meet. And actually make it a good story moment, don't make it just be like, "yOuR mY MoM wOw!" Have it actually matter and be the vehicle through with Thrall can use the Elements again
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Either one of those side's versions are fine in a vaccum but happening together at the same time kind of immediately broke the illusion for me. Wish they'd have just thrown in a line that's like, "We can't tell them cuz something something bronze dragonflight, timelines!"
I just took it as Thrall has done time travel before and knows the rules to them.