As a Amill idealist, I'm reading both of the discourse between you two, and you both have questions that the other cannot honestly, and scripturally answer. Matthew 24 discourse presents statements concerning the latter days just before the coming of Jesus Christ to gather together his very elect from the four winds of heaven, that other scriptures beautifully connects, which only those believers who hold to the position of Amill idealist have answers. As a side note: Matthew 24 and 25 is one complete discourse that must not be divided.
The preterist, or half preterist must removed 70 A. D. theory from their minds before they will ever come unto the knowledge of the truth contain in the Olivet discourse. The Premill, or dispensationalist, must removed the natural seed of Abraham as the centered piece of their interpretation of Bible prophecy, since they have absolutely no part in latter day Bible prophecy.
If you want to know how it works, the Nation of Israel is made up of both those who are the natural seed of Abraham, and those who are BOTH the natural and spiritual seed of Abraham. Hence Paul can say that not all who are of Israel (spiritual/natural seed of Abraham) are of Israel (they are only physical, natural seed descendants of Abraham, not spiritual.) In Zechariah, Israel, the nation of, is divided into three parts, where 2/3rds are marked for death, but 1/3rd will be saved, and God will purge and purify them. The only one's of Israel alive at the end of the time of Jacob's trouble, the Great Tribulation Jesus speaks of, which is the time of Jacob's trouble mentioned by the prophets of the Old Testament, will be those of the 1/3rd remnant of Israel. They will see Jesus at Jerusalem, and will recognize Him as King. ("Blessed is He who comes in the name of the Lord.") Jesus, in Matthew, after the Triumphal Entry, when leaving Jerusalem said that they would not see Him again UNTIL they say "Blessed is He who comes in the name of the Lord." That is, they will not see Him again until they recognize Him as King.
They still have not recognized Him as King. I'm not sure where you get that I have a problem with eschtology because of the natural seed of Abraham. The elect of the nation of Israel are BOTH the natural and spiritual seed of Abraham. The Gentiles are ONLY the spiritual seed of Abraham. All that matters is that the church, the people of God, are the spiritual seed of Abraham. Being the natural seed of Abraham has no bearing on whether one is a part of the church or not. It does have a bearing on whether one is of Israel or not, being of both the natural and spiritual seed of Abraham. Again, in the church, it doesn't matter if one is of the natural seed of Abraham. There is neither Jew or Gentile in the church.
The problem you will have with saying that Matthew 24 and 25 is one unified answer to three different questions is going to haunt you. It can be divided and still be one discourse. One can answer multiple questions in a single sermon/discourse. It does help to understand the disciples questions however. They asked for a sign of Jesus coming. The thing to understand is that they were not asking about Jesus second coming, because they didn't even know He was leaving. That word coming, in the Greek, speaks of a King coming/visiting their Kingdom or domain. The disciples were asking about the Father unveiling Christ and presenting Him as King, and Jesus enters into His Kingdom. They are asking about Jewish eschatology, the physical Kingdom on Earth in Jerusalem/Israel. And Jesus answers this question. They still did not know Jesus was leaving, given their question in Acts 1.
"6 When they therefore were come together, they asked of him, saying, Lord, wilt thou
at this time restore again the kingdom to Israel?"
What did Jesus answer? He did not say no did He? "7 And he said unto them, It is not for you to
know the times or the seasons, which the Father hath put in his own power."
Jesus restoring again the kingdom to Israel is a time or season. Jesus is saying, it isn't now, and it isn't for you to know when. However, know that the Father has set these times or seasons by His own power. So Jesus will restore again the kingdom to Israel, but not then, and in fact, it isn't for the disciples to know. That is the Father's business. However, Jesus did give a parable that gives the signs of the approaching "time of Jacob's trouble", and His second coming. The parable of the fig tree. He also gave an explanation of it not being for us to know the times or seasons with the parable of the absent master who is out on a journey, whose return time is not known. We are to be occupied as though His return is imminent and at hand, until He returns and finds us busy doing the business He left with us when He left. Or, He finds us foolish, full of debauchery, and not taking care of business, as with that servant who was out getting drunk, surprised when the Master comes home early.
When Jesus speaks of the "Great Tribulation", He is speaking of the prophesied "time of Jacob's trouble". That time will be the worst time ever faced by Israel from the founding of their peoples by God/Moses, to the end of time. Given the scale of horror of the holocaust, this isn't talking about the first century. Given Jesus didn't return after the holocaust, and the population of the world was not in danger of hitting zero if the war continued on a few more days, it wasn't the holocaust. Try to imagine an even that dwarfs both the first century and the holocaust, and, if the time is not shortened, would wipe out the whole population of Earth. That would most certainly qualify as a Great Tribulation, and, since the main focus will be on Israel, "the time of Jacob's trouble".