I think Moodie did a great job against New Zealand, but against Romania he showed he definitely has some room to develop in terms of decision making, and generally Kriel is one of our better defenders. Given the gameplan seems to be strangle Ireland, it's makes sense that the play is to bring in the player that is going to be better at that than the flair type player.
Really what we need to do well in this game is the same disruption in the backline of rushing up that we did to Scotland, while pummeling the rucks to slow down the ball. But then also be aware on getting good coverage in the chip over the top. Ireland were decent at countering us with this last year and we need to get on top of it. Scotland had opportunities to chip over the rush defense two weeks ago, but always looked to play it, which got them in trouble. I think the Irish has more versatility to counter us here.