The comparison is not there, simply because if Fruean is not picked at centre, but SBW is at 2nd 5/8th, then it seems like SBW is going to be picked on reputation. SBW did nothing to suggest he'll be more of an asset than McAlister. It's called confirmation bias, the commentators and fans look at every little thing SBW does, and everything he does half well, people claim he did brilliantly, however every mistake he makes, is dismissed because he is new. The commentators went on about his little off load, "he was only a foot off the ground" etc, and therefore people think he's great. They ignore the fact the offload went forward, and it caused a scrum. If any player in the whole of the ITM cup was given the same treatment in the ITM cup, by commentators pointing out every good thing they do, it'll make them look much better than they really are.
It pains me to say this, but they do the same thing with Tana Umaga. He's shown some real class, but a lot of it is over emphasized, and all mistakes are pretty much ignored.