Cruz has no authority for anything with that PAC. Cruz wants people to give to his campaign, not to a PAC. What the PAC does is on those people and the donors to that PAC.
Cruz can publicly point out that it looks like his supporters were bailing on him at a critical time to a worse candidate, but does that profit him? None of the money being shifted was from any of his own donors.
You’re right Cruz has no “authority” with the PAC. They aren’t supposed to “coordinate”. But they all met with Cruz in advance, and after meetings with him, decided to start the PACs to support him. And when the Cruz campaign wants an ad made, they put a bunch of video online so the PAC can download it and make an ad. And when the campaign wants the PAC to do something, they make a public complaint or hint, so the PAC will take action. Oh they can claim they aren’t technically coordinating, but they sure manage to get things done.