Thank you for providing that reference!
Mat 19:8 He said to them, “Moses, because of the hardness of your hearts, permitted you to divorce your wives, but from the beginning it was not so."
Very important, yes. As for me, I'm convinced that Jesus was pointing out to these men that their 'Hearts' were 'Hard'. They were asking him under what conditions they could divorce their wives, divorce being the compassionate alternative to keeping a women without respecting her rights as a mate, lover and mother. They already knew that divorce was such an alternative, so the only innovation was that he used their own compassion to point out that they were hardened in this area. His reply did not in my opinion overturn Moses one iota, instead providing a way for me and you to understand the purpose of the law. The fact that Jesus didn't say divorce was illegal goes in favor of Moses, elevating Moses for his insight.
Notice he does not say "God" but "Moses". And he states that the law of divorce, supposedly given to Moses by God, is not in harmony with God's desire. This contradicts a Torah of divine origin.
Lets us say that Moses was inspired and far sighted by the wisdom of the spirit. Jesus did not, for instance, overturn divorce when he explained the law of Deut 24 but criticized the men for making it necessary. It was therefore not just 'Supposedly' given by God or Jesus would have criticized the law itself as the cause of the problem rather than the hearts of men. (Moses refused to allow the 'Chained woman' condition what modern Christians have been guilty of -- where a man can ignore his wife's sexual needs, monetary needs, her children's needs but she's not permitted to divorce him.)
There are other examples with Moses where an ideal is put forward that no one is going to follow, and then an alternative less ideal plan is provided in stead of the ideal. Divorce and marriage wouldn't be alone in that, but its humanity that is not in harmony with God's desire rather than the law itself. Moses prophesied that the 'Children of Israel' would fall away from 'Serving the LORD' but that they would return. The laws recognized that and made provision for that eventuality. Moses also said Israel should not ever choose a king over them --- but that they when they did do it he should meet such & such requirements. (Deut 17:14, I Samuel 8:7, Psalm 118:22)
Then there are the "but I say unto you" statements Jesus makes in Matthew 5.
These also don't appear to overturn any law. Instead they point out the reason certain laws were implemented.
Jesus states in Mt. 5:17 that he has come to complete and perfect the Torah.
He says "...I have not come to abolish them but to fulfill them." In other words he doesn't 'State' what you have said. You are paraphrasing and claiming its a quote. Please don't do that.
Then there are the statements in the Gospel of John (I believe I already quoted these?) where Jesus refers to the Torah as "your Torah" and "their Torah" indicating it is not his Torah.
You may have a point here. I don't really know the significance of saying 'Your Torah'.