Sea Breeze : You got the wrong Jesus.
There was a lot of uncertainty about who Jesus was in the first century, and it is possible that the writer of Hebrews was addressing the view that Jesus was just an angel. As you say, Jesus was different because he was the only-begotten son, although I was not aware the scriptures use the term "essence".
However, there are other parts of scripture that indicate Jesus was the one the OT refers to as the angel of Jehovah. For example, Paul says in 1 Corinthians 10:4 that when the Israelites were in the wilderness "they used to drink from the spiritual rock that follows them, and that rock meant the Christ." Jude is even more explicit saying (in vs 5) that Jesus "saved a people out of the land of Egypt". This echoes Numbers 20:16 which says that God sent an angel and brought us out of Egypt, and Isaiah 63:9 where it says that God's own personal messenger (or, "the angel of his presence") saved them.
Interestingly, Justin Martyr routinely identifies the subject of OT theophanies with the pre-existent Christ or Logos. So (in Dialogue with Trypho, 56, 60, 126) it was the Logos who visited Abraham with two angels and destroyed Sodom, who wrestled with Jacob at Jabbok (Dialogue with Trypho, 58), and who appeared to Moses in the burning bush (Dialogue with Trypho, 59-60, 126-127). While Justin's understanding may not be correct, and his writings are certainly not equivalent to scripture, it certainly shows that this understanding was held by some. How does Justin countenance this understanding with the view that Jesus is superior to the angels? He explains, as I did, that the Logos is called "angel" because he is the messenger from God to humanity (Dialogue with Trypho, 56.4, 10; 76.3), not because he is the same as the angels.
Having said all this, I should add that scripture does not directly teach that Jesus is the archangel Michael. They both share similar roles so it may be inferred but it is not explicit, and so I don't consider the viewpoint conclusive.