The evidence shows a strong correlation between Mark and the OT + epistles. As I have said many times, these parallels aren't to do with 'prophecy fulfilled' verses but instead trivial events. It's there in black and white Drich. There's no 'faith' required to see what 'Mark' was up to.
Why does Peter's testimony (Gospel of Mark) sound like recycled OT verses and epistle teaching?
Why does Peter's testimony (Gospel of Mark) sound like recycled OT verses and epistle teaching?

"It is the mark of an educated mind to be able to entertain a thought without accepting it" ~ Aristotle