I don't think this has anything to do with set backs or dissatisfaction. The people in the articles are grasping at straws. Nomura's issue with the first trailer was, as far as I know, only pertaining to direction, not the assets or anything like that. That should be apparent given that the second trailer contained footage from the first, which likely it would not do if Nomura was dissatisfied to any meaningful degree.
Most likely this is a natural move of convenience. Originally FFVIIR was probably slated as a trump card in case FFVX didn't do as well as expected, and they outsourced it largely because they didn't have enough free internal resources to spare. FFXV sold well enough, resources have been freed up, and so naturally it would be both wasteful and counterproductive to keep development going over at CC2 given that the management and design team is located at SE and have to run back and forth anything of importance is happening.
Cutting out the middle man at this point is not a set back, rather it's a means of speeding up production. There is one caveat to this which might not be a positive though - this rush move might signal that upper management is pushing for an earlier release than what Kitase and Nomura was originally aiming for, and we all know what rush jobs do to ambitious games *looks at FFXV*