Simon and fatherhood
Would Simon have abused his child if Robyn had remained with him?
Given the fact that Simon was abused by his own father and brushes off his abuse of Gordo as serious, I think Simon would have abused his own son. Also, the fact that Simon also suspects that his son may actually be Gordo's, he would be especially horrible to the child and probably try to force Robyn to accept the abuse.
I'm glad Robyn left Simon. Whether the baby was Simon's or not, there was an ominous foreshadowing that Simon would be a very nasty parent to have around.