We do need to understand that the simple, little herb tree is sufficient in Jesus’ eyes for His redeemed. Therefore, it should be more than satisfactory for us.
How does God spread His kingdom? I don’t know. I just know that it is like the wind blowing and we can see and hear the effects (John 3). Those effects are because God has worked, and therein we should shout for joy!
If there were in fact two different resurrections, the perfect time to explain that would have been when Jesus was asked about this parable or when He spoke about it in John, Chapter 5.