It's also because of the way the Bible was written. It's easy enough to make a case for diametrically opposed arguments and each with the backing of scripture.
The bible is a spiritual book and will really only be understood through revelation.
We all come to it with presuppositions about God and a host of other topics. So if we evaluate scripture through those lenses our understanding will frame scripture rather than scripture framing our understanding.
Jacob/Israel is made up of all of God's elect children from every kindred, and tongue, and people, and nation (Rev 5:9)
Most of Jacob/Israel became disobedient to God and started worshiping idols. God scattered them to the ends of the earth, and blinded their eyes to the truth. They are still his elect, and have the promise of an eternal inheritance.
God left in the midst of them a remnant of a poor and afflicted people that will trust in the name of the Lord. The remnant of Jacob/Israel shall do no iniquity, nor speak lies; neither shall a deceitful tongue be found in their mouth; for they shall feed and lie down, and none shall make them afraid. (Zeph 3:11-13).
The disobedient Israel is the invisible church described as the larger wheel, in Ezk 10::10, and the remnant of Israel is the visible church described as the smaller inner wheel.
This also harmonizes with the two gates in Matt 7:13-14, The wide gate being the invisible church (disobedient Israel, who are blinded to the truth, and are teaching, and preaching false doctrines)), and the straight gate being the visible church (the remnant of Israel, who have been revealed the truth, by the indwelling of the Holy Spirit).