Good hypothesis that makes logical sense. However, if what you say is true, then it reflects poorly on the club that they would hire Cleary just to keep his son. No player is bigger than the club and if Nathan left because his Dad wasn't coach then so be it. Cleary simply wasn't the best coach available at the time he was hired, the club failed to run a proper recruitment process. Why? Only they can answer that but being Dave's mate seems to help.
The hiring of Cleary and taking control are not dependant on each other. They could have taken control and put in a retention committee all without selecting a 49% win rate coach.
The hiring of Ivan, and Nathan’s new contract, may have been completely independent of one another as well. Completely agree with you that no one player should be bigger than the club. No club should be run like that. It would lack professionalism.
The ‘talks’ with Ivan that led to his appointment were a shambles with O’Neill going in one direction and Gus in another and the timing was atrocious with finals around the corner. However, the board did get who they wanted, not Gus. That signals to me that the board were confident Ivan was the coach they could trust and work with as a team, both on and off the paddock. Maybe the issues Wayne was having with the Broncos at the time, and his standoff with Paul White, played into their decision. Just as Gus was working independently, maybe the board felt Wayne would do the same. Or that a Bennett appointment, with he and Gus’ long term differences of opinion, may cause unnecessary friction, unwanted attention and distraction and end in disaster? Perhaps they wanted a longer term appointment? Or perhaps the board felt the only way they could get full control of the club was to employ their choice of coach in Ivan. What has been reported is even after the establishing the recruitment and retention committee and getting the coach they wanted, Gus still went and did his own thing, upgrading contracts without consultation. When told that was not how things would be done now, he left. Employing Ivan, someone they knew and had worked with before, gave the board reassurance they could work together as a group to control the future direction of the club.