I don't see them as mutually exclusive - I think you see something novel being revealed... I do not. The Spirit of prophecy IS the testimony of Yeshua the Messiah. That no one understood the prophets is evident (to include the prophets themselves) - But the plan is there, lest the Messiah could not be proven in the Tanakh.
Did God promise Israel actual land on this earth, to be theirs forever, with Messiah ruling? Or did God promise Israel a heavenly position with Him? Were they (Israel) going to be actual flesh and bone people living in that land and did He offer Gentiles the same covenant promise?