I believe rogue PACs do exist but they have little money or influence. This PAC has the former communications person for Perry and Fiorina heading it. It has significant financial backing. This was not a rogue PAC but one who knew exactly what it was doing and someone inside the Cruz campaign knew and approved the ad before it ran.
That's my conclusion, also. They used Melania to get a reaction out of Trump, hoping it might damage him somehow. But Cruz looks like an idiot in his reactions.
And I bet when Trump says he might tell the people about Heidi, he means her Goldman, Sachs job and her work on committees related to globalist plans and goals.