To be honest I don't think Byrne has much issues in the backfield, he covers very well. Destroyed may not have been the word but he was dominant and had a very positive effect. He's a terrible defender against players with ball in hand and usually seems to completely guess what he has to do and its cost Leinster again and again since the Scarlets exposed him to beat us, hopefully Joe has him drilled.
Kearney had to be in, Argentina must be respected despite what has been said on this thread and a back three with less than 10 caps between them would be far too big a risk. Hopefully we open up a lead and Conway comes on for him but he's number one until anyone takes their chance in a tier 1 international to displace him (Zebo had many chances and mixed the sublime with the ridiculous again and again, Payne was needed at 13 and wasn't irreplaceable in SA) this is a tier 1 game with an experimental and inexperienced squad but the positions where mistakes can be hugely costly, 15, 9 and 10 have bags of experience which will only help the younger lads and make room for to test the waters for a new 15 in the future. It'll be Conway or Stockdale who will have plenty of caps and know the role from working closely with RK too, it'll happen when needed, its not right now.