Doesn’t it all make perfect sense? God is not the author of confusion. He had a purpose for the earth that was quite distinct from His purpose concerning the heaven. His purpose concerning the earth and Christ’s reign upon it is the subject of PROPHECY (2 Pet. 1:16-19). His purpose concerning the heaven and our exaltation there with Christ is the subject of “THE MYSTERY”. (Eph. 2:4-10; 3:1-11). He does nothing by chance. EVERYTHING is for a reason. AND He gives us the reason in His Word.
The heaven/The Mystery/the body of believers/Spiritual.
The earth/Prophecy/a kingdom of believers/Physical.
But I'm sure you already knew this :)