It's not like the loss of Pocock would open the door for the Irish to dominate the breakdown. The Irish don't really have a specialist no.7 anyway. McCalman will do fine. If he was playing opposite McCaw or Brussow I'd probably be worried.
On the topic of McCalman's place in the side, my general reaction to him is 'Meh'.....He's fairly big, he generally gets over the advantage line, he works fairly hard, he's not completely ineffective a the breakdown....meh.
He's certainly a player who wont let you down. He showed last year that he can step up to the plate when we need him, but I think people want someone more, if I can use the word, 'decisive' in the team. Robinson is a 7, Palu is an 8. At test level McCalman is a wishy washy backrower. There is nothing wrong with him, its just hard to get excited about him for any particular reason.
I'm happy for him to maintain his position until Palu is ready to replace him, and I'd have no problem with him filling in for Pocock in this game