That's pretty cool, I don't think people were necessarily expecting him. Also, from the second link:
Now that we have the new male character from the latest half of the Final Fantasy series, the remaining five DLC characters will be of the following:
New male character (from older half)
New female character (from newer half)
New male character (from newer half)
Female character who previously appeared in Dissidia Final Fantasy series (from newer half)
New male character (from newer half)
Maybe the two male characters from the newer half will be Cid Raines and Ardyn in order to keep the whole hero/villain balance going.
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https://backloggery.com/megadriver