The Zoroark Memory Link heavily implies that it's actually N speaking as the Zoroark, and also implies that N wasn't noticed by former team Plasma members because he was in Zoroark form.
Start at 9:22
https://youtu.be/Np5Ias8It-w?t=562Also, when you meet N to fight him in BW2, you can interpret the Zoroark outside the cave as actually being N in disguise and not the Zoroark in his party.
Some of N's kingly similarities to the King of the Abyssal Ruins were said to be a result of Ghetsis's grooming, but I always took the Abyssal Ruin's line of "king speaks to all" to mean that the Abyssal King was a Zoroark himself as well.
