Their is the obvious temptation and a lot of information it can be difficult to put a different spin on the topic
It's why it's hard to go after people for plagiarizing
I've read some of his books particularly the last two and I do what he content he releases five videos per week
But he doesn't do it alone he has a small media team and researchers
That true about Paul Kennedy and most books to be honest they are meant for general consumption
Sometimes the large the topic and the broader it is the less actual information and meaning can be derived
From those bodies of work
Don Jones Plantagenets is a great example of that it's a good book to be an introduction to the topic of medieval England
Same goes for his other book the power of thrones