I think it would have been much more interesting if Rob had not hit Helen and let her hit him. It sounded to me like she was going to hit him and may have actually done so.
He would have then been the victim and could have had Helen put in jail and perhaps even been able to keep Henry through this step parent legal document he got.
We all know that he’s really the cartoon villain and if that all did happen it would be wrong, but at least it would be more interesting than the current utterly predictable yet completely unrealistic story we’ve got now.