The Dead Sea Scrolls (popularly thought to be Essene) was led by leadership thought to be descendants of the "legitimate" high priest lineage which the Hasmoneans ousted.
In Gospel of Judas there is direct conflict with what we have presented to us in the NT.
I have some difficulty with this Essene scroll because it appears to set Jesus up as a suicidal martyr. And also because we have only a few crumbling fragments, which means much of the information of filling in the blanks is speculative.
The only possiblity that could maybe give this credence is that, since Jesus knew they were eventually going to kill him, that by choosing how and when it was done, he might be able to reveal one last travesty to the masses through this.
I am sure he was weary; the years of his ministry were intense. But moreso, in having the power and authority to choose his manner of death, he hoped to reveal something more to the people.
First of all, no Sanhedrin priest worth his salt would have been present at a trial during the time frame of Passover. (Trial took place Thursday evening and Friday morning.) Perhaps Jesus thought that there was a better chance of bringing these dark deeds to light and this was the last opportunity.
The dominant historical view is that the Sanhedrin was controlled primarily by the Sadducees which were associated with the ruling elite. There were only 23 members of the Sanhedrin attending the trial of Jesus; the entirety of the council of 70 did not attend. Most of them would have been studying in preparation for the Passover.
The kangaroo court was held at the home of Caiphus, who was a Sadducee.
The Sadducees were Aaronites who were associated with the leadership of the Temple in Jerusalem. They represented the aristocratic group of the Hasmonean High Priest, who replaced the previous High Priest linegae. The earlier priestly lineage was blamed for allowing the Syrian Emperor (Epiphanes) to desecrate the Temple of Jerusalem with idolotrous sacrifices and to martyr monotheistic Jews. (The Hasmoneans ruled as "priest-kings" claiming title of high priest and king simultaneously.)
As far as the Sadducee beliefs--they rejected the existence of an afterlife and denied resurrection of the dead. They also insisted on strict literal interpretation of the five books of Moses. An eye for an eye meant retribution returned in kind.
I tend to believe that the Sanhedrin was infiltrated by a dark cult that were not representative of the majority.
Now the question remains: Was Judas of the same thought as the Sadducees? Or was he instructed by Jesus in hatching a plot of martyrdom?