We need a specialist full back, if Cooper isn't fit then I would play Byrne. Byrne is a better full back then a corner back and would do ok for us there against a traditional full forward.
But Kildare have very good forwards. We have seen loads of them at underage because they usually end up playing Dublin at some stage and particularly at u21 level I have been blown away by the quality of some of their forwards. They will do damage yet in this championship. I wouldn't be amazed if we met them again down the road.
If we do, then Dublin's midfield need to realise they are in a difficult battle and need to concentrate on stopping their opponent fielding the ball rather then trying for a clean catch themselves. If MDMA was on the field, half of those marks wouldn't happen as he would have been breathing down the midfielders neck and attacking the ball with a vengeance.
On the mark - it was trialled years ago and worked very well, but was voted against. It demonstrates the stupidity of the rules being set by such a wide grouping of people who may not even have a huge interest in football...