I’d be interested in the writer’s evidence that Hebrews was written by Timothy. It’s something that has always puzzled me. The King James attributes it to Paul, but later translations don’t identify an author.
In English it sounds like something Paul could have written, but one of my pastors once told me a major reason it is no longer attributed to Paul is that the style of writing in the original Greek is very different from the Pauline epistles.
Could it be a possiblity there were those who were close to Paul and most likely knew his work and did the best to reassemble from what they knew?