The one that they've been sitting on a huge story at the request of Mueller's team, likely explicitly showing collusion considering how the right was trying to push the "collusion is fine" angle last week.
Maybe they're waiting to get their sources and info straight, but I just don't buy them actually
sitting on bombshells that are ready to go, at Mueller's request or not.
Most journalists I've known want to tell stories and want to inform the public. And being "first!" is important because it is a tangible way to show you are better at your job than the competition. After all, a news organization that is always second or third with a story isn't going to be the place most people check with first. And on a personal note, it's fun to beat others to the punch. And at the level we're talking, that could also bring some major, life-changing awards your way.
Every day that a news organization waits on something like this is a day that their competitors could beat them to the punch and I just don't buy holding something beyond a week or two if it's all corroborated and ready to go.
Sitting on one of the biggest stories of all time (which means you are just waiting to get scooped) is far less believable to me than people on the fringes who are over-inflating rumors and/or making things up wholecloth to get attention.