In other words once these "foregoing ones" the Angels had materialised and made themselves Demons by forsaking their spiritual bodies and materialising and "gone after flesh for unnatural use"......... thereon at the Flood these Angels were stopped from materialising as physical beings and imprisoned in their spiritual bodies as he states they were "reserved in eternal bonds"... ie restricted.
Holy crap. You are pinning your whole argument on one passage in Jude against no other evidence in the other 65 books of the bible. Very, very shaky ground.
For ease of explanation
1. There is no mention at all of “the sons of God” coming down from heaven.
2. Why assume these “sons of God” are angels? The phrase is used concerning men, especially those who know the true God (Deut. 14:1 (R.S.V.); Hos. 1:10; Lk. 3:38; Jn 1:12; 1 Jn. 3:1).
3. If believers are to be made equal to angels (Lk. 20:35-36), will they still experience the same carnal desires which then motivated the sons of God, or have the possibility of giving way to them? Of course not!
4. Luke 20:35-36, clearly says that the angels do not marry: “They which shall be accounted worthy to obtain that world, and the resurrection from the dead, neither marry, nor are given in marriage...for they are equal unto the angels”.
5. It is commonly believed that the angels who are thought to have sinned came down to earth at the time of the garden of Eden incidents, but Genesis 6 concerns the time of the flood, which was many years later.
6. The Hebrew word for “giants” in Genesis 6:4, is also used to describe the sons of a man called Anak in Numbers 13:33. Freak human beings of unusual size or strength are sometimes born today, but it does not mean that their parents were angels.
7. We are not specifically told that the giants were the children of the “sons of God”. “There were giants…and also after that…the sons of God came in unto the daughters of men” (:4).
8. If Angels married women, then who were the children, and what were they like? The apocryphal book of 1 Enoch claims that the offspring were "evil spirits" and witches (1 Enoch 15:8-16:1)- but the Bible is utterly silent about this.