Some are more consistent that others.
The way I have heard it, with my own ears, involves separate eternal destinies. And, of course, separate promises. This from a man involved at the time (he's dead now) in some way with LaHaye's pretrib group.
I will agree with Lee N. Field here - I have argued against dual-covenant Dispensationalists right here in this forum. The gist goes something like Christians getting raptured before the trib, then the Jews are left and the Mosaic code kicks back in for the tribulation...
What you posted no doubt exists but it is not the dispensationalism of Ryrie, Walvoord and the likes of Dallas theological seminary. I would not know what seminary or university such hyper dispensationalism comes from. But it would no doubt go hand in hand with the mid or end of Acts church vs Pentecost church. As I have pointed out in other threads is error given there is only ONE Gospel as given by Jesus Christ in Luke 24 and confirmed by Paul in 1 Corinthians 15.
“Traditional” dispensationalism has one church age not two or three as I remember it. Most believe the church age ends with the rapture (and there are varying views of timing pre, mid etc) in which time Israel becomes the focus of redemption through the shed Blood of Christ. Yes I’ve seen some of the other views here on FR of tribulation Hebrews instituting the Mosaic sacrifice system etc. but never came across that in the traditional dispensational writings. I have seen criticisms against the 1,000 year reign and Ezekiel temple institutions by some saying ‘that’ suggests dispies are promoting two paths to salvation. However I think you would probably disagree with such criticisms.
So honestly I don’t know where some of these views of separate bodies and gospels are coming from. I know of no seminaries promoting such which leads me to believe they are internet machinations.
I will point out that comparing a traditional dispensationalist with a hyper dispensationalist is akin to comparing a traditional post millennial to a modern prederist. There is a huge gulf.
One of the points I forgot to mention to you earlier. The “theme” throughout most of the Prophets is one of ultimate deliverance of Israel as a nation. Hard to ignore when reading the OT prophecies. For example:
Isaiah 46:3-4 NASB
“Listen to Me, O house of Jacob, And all the remnant of the house of Israel, You who have been borne by Me from birth And have been carried from the womb; Even to your old age I will be the same, And even to your graying years I will bear you! I have done it, and I will carry you; And I will bear you and I will deliver you.