It’s not a leak if an official with the legal authority to release information to the public uses that authority.
Not a day goes by without someone of FR demanding that Trump authorize the release of some information or other. That would not be a “leak” either.
If the information was “embargoed” until a specific day/time, that it is a “leak”. The fact that Rosenstein knew that congressional staffers were going to “leak” this information ahead of its official release time means that he was covering up for them and their bosses, also a crime.
Time for the man “to do the time”.