I think that before the fallen angels took on the curse of God they had time as angels, and naturally as angels they can turn into normal looking men. I assume that angels are taller than men and smarter and more powerful. They are taller because it takes just two to take a soul in heaven, how many people hold a coffin at a funeral. 4 to 6 perhaps even 8 dependent on size of the person. They are smarter and more powerful because they know God and everything around God automatically receives glory and splendour in its own right. It wouldnt make sense for angels to be lower than men naturally. The bible even says that angels are higher than men. It took just two to wipe out Sodom and Gomorrah.
Angels or apostles are messenger sent by God as prophets. They declare the word of God's prophecy or tongue .
The opposing spirit comes along with to try and snatch the seed of God's understanding. Like with Job. We continue to plant and water it with the doctrines of God. But He must cause the growth if any.
As believers we do not wrestle against flesh and blood but do against unseen lying spirits as Christ works with us. .
Why would the father of lies "Legion" destroy what he needs to build on. . he has no form or DNA substance, ?
The renown in that section are sons of God, mighty men of faith moved by the Spirit of God. Like David moved to slay the renown of the father of lies.