So then who wrote Hebrews? It wasn't Paul's writing style, and it doesn't name it's author. Matthew and Luke don't name the Q source material they have in commo

So then who wrote Hebrews? It wasn't Paul's writing style, and it doesn't name it's author. Matthew and Luke don't name the Q source material they have in common. Let's take gMark, someone composes it around 70AD somewhere. It gets copied and sent to other communities elsewhere. Decades later it's attributed to Mark.