There is no gap, except in the mind of Darby and his faithful followers.
AMEN! One would have to read a lot of Darby and Scoffield and very little of the Bible (and ignore Hebrews altogether) to come to another conclusion.
"That is, They which are the children of the flesh, these are not the children of God: but the children of the promise are counted for the seed." -- Romans 9:8
Jesus Christ, the only seed.
"There is neither Jew nor Greek, there is neither bond nor free, there is neither male nor female: for ye are all one in Christ Jesus." -- Galatians 3:28
Dispensationalists assert Jews and Gentiles are all part of the Church. The Church and Israel are different objects, though in Prophecy.
There is nothing in Prophecy to preclude the Rapture from coming at present. It is immanent, not to be confused with immediate, as is clarified in 2nd Thessalonians.
There are prophetic events which must be fulfilled prior to the 2nd Advent, i.e. the Rapture, the Great Tribulation, the Apostasy, and removal of the Restrainer.