#1 - Aug. 1, 2017, 8:26 p.m.
Because I can't see any other way that 2 planets so far apart could possibly have the same animal living on it.
Same with the new mana-rays coming in 7.3... Blizz said they are distant relatives of the Nether-Rays from TBC... so again did the Draenei bring those with them to Draenor?
The only other explanation is that Blizz is unimaginative and didn't want to come up with distinct Flaura/Fauna for Argus. (which is sad since I always hoped Argus would be this place full of things we have never seen in this game before)