Those verses only indicate the conclusion if the conclusion is first assumed. You asked me how I understand certain verses. It is better to inquire about my understanding of the Davidic Covenant, which can ONLY be understood in the light of the Son of David ruling on the earth. The book of the Revelation affixes a time-period to the length of his earthly rule, a millennium. Attempts of amillennialists to disregard that time period fall flat.
Read Acts 2:22-36. Understand that David's throne is promised to Jesus - and that David saw ahead that the one to sit on his throne was the Christ Jesus. Jesus ascended into heaven to sit on that throne. Jesus is immortal and can die no more, so he now reigns instead of anyone else; at the approval of God the Father, for the Father has given all power to Jesus to rule over heaven and earth.
Explain how you get that Jesus is to reign only during the so-called "one thousand years" mentioned in Rev. 20? Why would He need to do that? Who is He going to reign over, expecially with a "rod of iron"?
In further thinking on the above, let me say that I don't really understand what you mean by the above. Thusly, I can't intelligently comment much on it except to give my own viewpoint. Sorry, I guess you will need to expound more on the above idea.