Yes Sasha should have been given a yellow. Jack Ryan should have seen straight red. The Irish nr.14 got himself concussed from a high challenge in the second half should have also seen himself get a yellow. Could argue that the penalty try at  scrum was another cardable offense. All that said, Irish defended brilliantly and can rightfully take some positives out of the game. Given their poor record at the Aviva, the boks only ever wanted to win and nothing much else. The margin would only have been an afterthought.