Evidence please.
The timing of the gospels by itself makes non-sense of your claims. For example James is believed to have died on about AD44, some 30 years before the gospel of Matthew.
James, the brother of the apostle John was certainly martyred at an early stage. 42AD would be my preferred date but I have no problems with any date from 41 to 44AD. We have no record that he ever wrote anything and if he did it is long since lost.
The almost unanimous view of the early church is that the Letter of James was written by James, one of the natural children of Joseph and Mary and generally known as the Lord's brother. He was the recognized head of the church in Jerusalem. James was martyred in 62AD so if he was the author of the Letter then it would have been written before that. In fact some conservative scholars believe it could have been written quite a few years earlier. Arguments put forward in support of this view include:
In James 1:1 we read that the letter is written to “the twelve tribes in the Dispersion”. Thus the audience for James’s letter is almost certainly Jewish Christians only and not Gentile Christians. Strongly suggesting it was written before the results of Paul's missionary efforts had led to large numbers of Gentile Christians.
In James 2:2 where James talks about your “assembly” the Greek word he uses is actually ‘synagōgē’. But it did not take long for the term Church (Gk ekklēsiastēs) to be used to describe the meetings of believers. Once again evidence for an early date for James.
While the 'argument from silence' should only be used in a secondary support role it can possibly be applied here. James played the key role at the Council of Jerusalem. If the letter had been written after the council (AD 48–49), it would be expected that James would have mentioned the issues from that momentous occasion. But he did not.
The above would all support an early date for James when the Church was still predominantly Jewish and the exiles were those from one of the earliest persecutions of believers in Judah. This would make it a possible contender, together with Galatians and 1 Thessalonians, as the earliest of the New Testament Documents.
Of course liberal scholars do not like such arguments as the need to insist that all the New Testament documents were written long after the events drives them to find another James of a much later date.