Didn't you create a thread asking why Oda doesn't show the fight, claiming Oda wants to hide the fact Shanks relies on another power greater than swordsmanship?
Why no WSS title for Roger? I guess because the PK title is the greatest title and the center of Roger's character and the story, while it would be irrelevant for the grand scheme of things that Roger was the strongest among the swordsmen in his period of time. It would add nothing to the narrative. Also, I guess the "WSS title" wasn't as relevant overall before the great era of piracy.