How about that person prepares those Topics in a locked Category to which only he and other leaders have access. They will then not appear in Latest for everyone until they are ready to be published, at which point they can be moved to a more public category and seen by the general readership?
Also, consider muting some Categories from Latest completely, as explained here: "Suppressed from latest" category vs. "muted" category. What is the difference? - #2 by tshenry