One might ask, how could Jesus be used by God as his "master worker" in creation, yet not be "greater than the angels"? The point is that the scripture is talking about STATUS and AUTHORITY not work or effort.
To illustrate:
I am a father of several sons. One day, I ask the eldest to join me in constructing a new house for all the family. I provide the materials, and direct his work according to my plans.
However, during this time I do not give him special status or favours - he wears no fancy attire, isn't favoured with better food, more luxurious accommodation, greater wealth or more rights in the household compared to his brothers.
Because he loves me, he is often the first and most vocal to speak in support of me, but I do not conspicuously elevate him above the rest of my children.
However, years later, after he has finished the family house and other activities, he takes on a special mission to travel to a distant land to promote my business. While there, he suffers abuse and in recognition of his work and affection for me I contact the people of that land directly, letting them know I endorse him and he has my full authority to act on my behalf and will inherit my business. However, the people there do not listen and eventually he is deported back to my family's homeland.
As a reward for his considerable efforts and sacrifice, I *then* reward him with extra favour and status in front my family, giving him full inheritance.
Jesus was humbly content to remain just as subject to his Father in the same way as all the (other?) angels UNTIL the point when the Father GAVE him greater authority. This is why Philippians 2:6 says "he did not consider equality with God something to be seized" - he was content, although being a spirit person the same as his Father is, not to try to take equal status with his Father. He was content to stay on the level with the other spirit persons at that time (inferior to, and subject to, the Father), until his Father would elevate him to His right hand in due time.