User blog comment:Yeit/Gol D. Roger devil fruit???/@comment-3279487-20120306133355

If that was the case the, it would be damn boring... I don't like too much parallelism between Luffy and Roger, it's superfluous we all know that he will be the next pirate king, not need to continually legitimate him. By the way, Shanks knew that was the Gomu Gomu no mi simply because there is a book with the description of a lot of fruits.