Wrong, the Void Lords are envious just because they can't manifest in the physical reality. In truth the Void Lords are the greatest power in the cosmos and the mere knowledge of them made Sargeras mad. Evem the mysterious first ones are afraid of them, that's why they wanted to protect the Shadowlands from what is beyond.
The Void is the most powerful and insidious force in the Warcraft verse, visit Mac'aree in the game if you don't believe me.