The Dan 9 6 accomplishments are all about his Gospel. People will keep sinning, but Christ will do what Israel could not do. That's why Israel the nation is ruined (the last verse), but there is still forgiveness.
Up to this point, I think Daniel, and most in Israel, thought that forgiveness meant day to day blessing. But the answer to Daniel's prayer here goes two directions on that. The sins are atoned for, but the nation goes to decimation. But the covenant that is coming is not just about Israel anymore. It is NEW. New parties. New bases.
The man of sin is only in the end of Dan 9 in the last verse, where he ruins the place in his rebellion, the same as 8:13. This is how Josephus the priest understood it, and this is what Caiaphas tried to circumvent in Jn 12. If there is a surprise to the NT (or to Judaism in the NT) it is that they didn't call Christ AC, although I guess sometimes calling him The Blasphemer was in reference to the man of sin figure, by mistake.
That is you reading your 1P into all that.
Daniel 9 is clear that Israel's restoration is in mind; the angel Gabriel reaffirms as much to Zachariah; and to Mary in Luke 1 and 2, as does the Spirit Himself there.
All of which is based on the fact of Gabriel's words to Daniel...
Daniel 10:21 But I will shew thee that which is noted in the scripture of truth: and there is none that holdeth with me in these things, but Michael your prince.
On OT promises.
Daniel 9:2 In the first year of his reign I Daniel understood by books the number of the years, whereof the word of the LORD came to Jeremiah the prophet, that he would accomplish seventy years in the desolations of Jerusalem.
9:16 O LORD, according to all thy righteousness, I beseech thee, let thine anger and thy fury be turned away from thy city Jerusalem, thy holy mountain: because for our sins, and for the iniquities of our fathers, Jerusalem and thy people are become a reproach to all that are about us. 9:17 Now therefore, O our God, hear the prayer of thy servant, and his supplications, and cause thy face to shine upon thy sanctuary that is desolate, for the Lord's sake. 9:18 O my God, incline thine ear, and hear; open thine eyes, and behold our desolations, and the city which is called by thy name: for we do not present our supplications before thee for our righteousnesses, but for thy great mercies.
9:21 Yea, whiles I was speaking in prayer, even the man Gabriel, whom I had seen in the vision at the beginning, being caused to fly swiftly, touched me about the time of the evening oblation. 9:22 And he informed me, and talked with me, and said, O Daniel, I am now come forth to give thee skill and understanding. 9:24 Seventy weeks are determined upon thy people and upon thy holy city, to finish the transgression, and to make an end of sins, and to make reconciliation for iniquity, and to bring in everlasting righteousness, and to seal up the vision and prophecy, and to anoint the most Holy.
Luke 1:30 And the angel said unto her, Fear not, Mary: for thou hast found favour with God. 1:31 And, behold, thou shalt conceive in thy womb, and bring forth a son, and shalt call his name JESUS. 1:32 He shall be great, and shall be called the Son of the Highest: and the Lord God shall give unto him the throne of his father David: 1:33 And he shall reign over the house of Jacob for ever; and of his kingdom there shall be no end.
Luke 1:46 And Mary said, My soul doth magnify the Lord, 1:47 And my spirit hath rejoiced in God my Saviour. 1:54 He hath holpen his servant Israel, in remembrance of his mercy; 1:55 As he spake to our fathers, to Abraham, and to his seed for ever.
I know; Mary was just confused by Judaism.
Nonsense.
Luke 1:67 And his father Zacharias was filled with the Holy Ghost, and prophesied, saying, 1:68 Blessed be the Lord God of Israel; for he hath visited and redeemed his people, 1:69 And hath raised up an horn of salvation for us in the house of his servant David; 1:70 As he spake by the mouth of his holy prophets, which have been since the world began: 1:71 That we should be saved from our enemies, and from the hand of all that hate us; 1:72 To perform the mercy promised to our fathers, and to remember his holy covenant; 1:73 The oath which he sware to our father Abraham, 1:74 That he would grant unto us, that we being delivered out of the hand of our enemies might serve him without fear, 1:75 In holiness and righteousness before him, all the days of our life.
Do you even know the sense of Luke 1:67's "Zacharias was filled with the Holy Ghost, and prophesied, saying,"?
It is...
2 Samuel 23:2 The Spirit of the LORD spake by me, and his word was in my tongue.
It is...
2 Peter 1:19 We have also a more sure word of prophecy; whereunto ye do well that ye take heed, as unto a light that shineth in a dark place, until the day dawn, and the day star arise in your hearts: 1:20 Knowing this first, that no prophecy of the scripture is of any private interpretation. 1:21 For the prophecy came not in old time by the will of man: but holy men of God spake as they were moved by the Holy Ghost.
You simply refuse to believe the passages' own witness; you simply refuse to look at those passages in light of the passages.
As with those countless supposed Bible "based scholars" - who deny the Exodus because the passages do not match their handed down errors.