I've noticed that nearly everyone has had a different interpretation of Luffy's message. I've also noticed that everyone's thoughts on this matter was sprawled across the whole OP section, so I wanted I nice place where we can discuss this message. I also was too lazy to search the threads themselves for your thoughts. Support my laziness and tell me your ridiculous theories on what Luffy wanted to tell his crew.
Also, about Zoro not understanding it. Zoro is always the first and sometimes only person to know what Luffy is thinking. Luffy doesn't have to say anything and Zoro knows what to do. That would mean that this message isn't Luffy's Idea.