Cruz and Rubio both GOPe. The sex scandal had to come out sometime. So, GOPe leaked the story when it could do Trump the most harm and Cruz the least harm... right after Trump’s triumphant AIPAC speech.
Perhaps you are right- perhaps it was the GOPe who did it- we won’t know for sure likely, ut it did seem like trump was the one who ordered it after the threats, and after the carson deal (Ne publishing that hit piece on him) and after learning trump’s buddy works at NE- I do not believe rubio ordered it after dropping out