The Midwest Center for Theological Studies blog has some notes on the four gospels, which largely rely on Why Four Gospels?. (HT: The Voice of One Crying Out in Suburbia)
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The Impact of the Gospels
Read notes by Dave Black at The Jesus Paradigm.

Interview with Dave Black on Why Four Gospels
https://youtu.be/vW4mYR-h95g (must be watched on YouTube).
Gospel Dates in Relation to Philippians
7:16 PM Mark over at Alternation continues his excellent discussion of the book of Philippians, which we are now studying in Greek 3. His current passage is 1:12-18. In verse 14 Paul refers to the “word” which the Romans believers were speaking boldly and fearlessly. Concerning this word, Mark states: The word is not yet…
Dave Black at Shepherds Theological Seminary
(We had a report on this from a member of the audience, linked earlier today.) 8:23 AM At the Shepherds Seminary last night I spoke on the origins of the four Gospels. And what a great time we had.
8:10 AM Saw this today: One of the many curiosities in the study of the NT and earliest Christianity is the early history and fortunes of the Gospel of Mark (hereafter, GMark). On the one hand (assuming the dominant view of Mark’s priority), the GMark appears to have been very influential. It is widely thought…

Where Does Mark Fit in the Gospels?
Sunday, January 31 10:28 AM In our Mark class this week we will be focusing on textual criticism, verbal aspect, and the Synoptic Problem. Why do we have four Gospels? Where does Mark fit in? In Matthew, Jesus is king. In Mark, Jesus is servant. In Luke, Jesus is fully man. And in John, Jesus is…