Well, you are a lot closer to the composition of all the Gospels than Bart Ehrman, Jimmy Tabor and anybody connected to John Dominic Crossan and the JEsus Seminar,
The Gospel of Mark was composed and forwarded by Cornelius to Theophilus in Rome around 40 CE, soon after the events dexribed in Acts 10. Peter's Confession in Acts 10:34 - 43 provides the narrative spine of the Synoptics and the basis of the Apostlle's Creed, At that same meeting, Cornelius conveyed to Peter the actual contents of the intelligence report, or euangelion,, Pilate sent to Tiberius that Terullian cites in Book V, of his APology. This disclousure of Pilate's writing in 33 CE becomes the basis for the Gospel of Pter, which Peter conveys to Pual at the Jerusalem Council in Acts 12 and is cited 19 times by Paul in his Epistles as a bona fidi expecially to the Romans in Phukuoouabs,
The Gospel of Mark is published by St Mark in Alexandria some time after John Mark abandon's Paul and Banabus and returns to Cyprus. John Mark becoms St Mark in Alexandria and estabishes a publishing house of copyiest whose output produces 80% of the manuscripts we have from before Constantine, or the 4th Century, according to Dan Wallace. Dennis MacDonald and RObyn Faith Warslh both advance the premise that the Gospels are the product of a literary committee, which is exaclty correct, that includes Cornelius as the curator of Quelle and the common denominator in all the Gospels as Pilate's senior centurion that was in the room with Pilate during the interrogtion of Jesus. Both Matthew and Luke have access to Quelle trhough Cornelius and Cornelius is the intermediary between Luke and Theophilus, who has a role in Rome in the executive strata of the Praetorian Guards similar to George Smiley's role in John Le Carre's MI6.
The Gospel of Matthew is a polemic written in response to Galatians and supports the Judaizing of Peter and James, Like the Gospel of Mark, which is the clinical description of the events covered by the Gospel of Peter, which is extracted from Quelle, In the Greek εὐθὺς is an apparatus of the Roman styule book of staff reports that means "footnote" or "SEE: Quelle". Quelle is the archives of the Roman intelligence reports about John the Baptist and Jesus. Both the Gospel of Mark and John begin when Jesus pops up above the Roman military horizon when he takes command of the Repentence political movement. By the time He is arrested, 30% of the Jewish population in Judea had been baptized by the Baptist and Jesus's disciples. Anyway, εὐθὺς is employed 41 imes in Mark to verify Peter's narrative as anchored by eyewitness reports of Jesus activites by the Roman spy system and the reports of the soldiers of the 10th Legion.
The Gospel of Luke and Acts draws heavily on Quelle, Everthing before Acts 17 is research Luke does while Paul is under arrext in Cesaerea. εὐθὺς is used once in Luke to establish Quelle as the authority of his writing as coming from Quelle and one in Acts 10 to signify that the meeting of Peter and Cornelius is recoreded in Quelle. The mention of the two angels at the empty tomb is a reference to the vision of the Talking Cross in the Gospel of Peter contained in Quelle.
The Gospel fo John is the memoir of St. Mark of Alexandria from when he was 12 yeawrs old and halfway through a Bar Mitzvah year, until the crucifixion of Jesus when he was 15. He was witness to the effusion of blood and water as validated by εὐθὺς, as well as the identity of the betrayer Judas. The Gospe3l of John is an eyewitness account, although there is a certain amount of artfulness around the cleansing of the Temple and the Triuphant Entry. John Mark wasn't at either one but was told by Peter. John Mark was sitting shiva with Mary and Martha in Bethany for Lazurus. The narratives of Mark and John converge at Mark 6 and John 4, 5, 6, when the 14 year old John Mark accompanies Jesus and His Disciples from just after the Autumnal Equinox to just before Pasover with the feeding of the 5000, and with Mark 11 and John 11, when Jesus leaves Mark after surveying the Temple and enters John when He arrives at Bethany and is greeted by a doubling of the greeting that signals the beginning of His march to the Cross. John 11:35 is the moment in the Bible when BCE becomes CE. John Mark is a Virgo with his Birthday sometimes around September 6 CE. We know this because his psychology is fully exposed by the text,
Revelation was not written by John Mark, but by another John, maybe the Apostle. It was dictated in Hebrew which is why the Greek is so poor. It was written no later than 68, while Nero was still alive which is the numerological meaning of 666. This is the number of Jesus's Death Warrant and Revelation 13 is a sort of Cubist literary description of the centurion in Mark 15:39. Jesus is NOT in the night mare visions of Revelation 5 - 22 except for the mention of 666. Revelation is a portarit of the toxic spiritual warfare in Jerusalem that was going on when Jesus was alive and is the source of His prediction of the destruction of the Temple,, We know this is so because Pilate's wife has a night mare arising from this artifact of the political polarization in Judea. The psychosis evident in Revelation is identical to the toxic spiritual warfare of the Pro-Life Evangelical chaplains who are the source of the culture of sexual assault in the military and the elevated suicide rate of combat vets. Every time Trump holds a laying on of the hands in the Oval Office, the Christian Nationalists are pumping in the psychosis of their spirutal warfare directly into the soul of Trump, and he is being tormented by the 7 unclean spirits taht Jesus drove out of Mary Magdalene.
Just for the record, the thesis of Bart Ehrman and the Jesus Seminar that the Gospel of Mark is dervative of Pauline Theology is a consequence of the Historical Critical Method of the Post Modern Historric Deconstruction, The Historical Critical Method is a Trojan Horse fot he Marxist construct of the Jesus Seminar and the Weather Underground of Jimmy Tabor. It is a false construct,