But you have not posted a verse that supports your claim the Jesus made the OT better. Jesus fulfilled the law and now we are not under the Mosaic law but we are under grace.
Heb_8:6
But Jesus has now obtained a more excellent ministry, and to that degree he is the mediator of a better covenant, which has been enacted through better promises.
Heb_12:24
and to Jesus, the mediator of a new covenant, and to the sprinkled blood that speaks a better word than the blood of Abel.
Now you give scripture that supports your belief that your definition of fulfilled means done away with. I can give scripture that supports that Christ did not do away with the law. I would also like scripture that says that being under grace means that we are not to listen to law any more.