User blog comment:Komni D. Dragon/My Theories/@comment-5962458-20130519032650/@comment-1595565-20130520010038

It was about the disease. He meant people's memory of him will never die. As for what Newgate said to teach, he simply meant Teach was not the kind of man Roger had in mind. Nothing about ghosts. We know next to nothing about the Will of D, so don't even try to convince anyone of anything. Lastly, unless you can cite a chapter where it was stated that Roger used haoshoku haki, then there's no recorded instance of him using it. Anime isn't canon.