It basically aggregates stuff from all over the media. There’s very little “unnamed source says…” postings. Everything is usually sourced and pure speculation by the site owner if clearly differentiated from the pure speculation of “baseball insiders” —like this where Keith Law is speculating. I don’t know the last time Law was right about something, but I think he’s generally well-regarded. Not being able to read Insider, I have no idea what he specifically says about the Sox and Castro.