The new testament and the ambiguous use of the term lord is rooted in a believe that Jesus was the Angel of the Lord, the word of the Lord, The Glory of the Lord, The Wisdom of the Lord in the old testament. The figure that seemed to be separate and yet equal with god.
The objections to this usually follow three paths.
1. Jesus speaking in this humanity. John 17.3
2. Verses out context. ie ( firstborn of creation )
3. God somehow gives his power and authority to another person who asks acts and speaks as god but isn't, those making Jehovah just a god.
I understand a lot of this is quite if a tree falls in the forest , what came first , the chicken or the egg etc etc.
The quite remarkable part is how little a JW knows about the new testament narrative. It is just nuts that a person can go door to door claiming to teach the bible with no clue of the unfolding story.