To have some credibilty in what are saying you need to quote the whole story.
In everyone of Brawn's interviews he says he is expecting a big jump in performance, but he does not know what the others have come up with either.
So he is fully aware of what could happen. I would also hasten to add that while every man and his dog(including me) have said the car is unfinished, why would it be necessary to point out the rough body work at this stage? We can see Brawn and his team have an eye for some innovation, with the double diffuser and front wing of 2009, and the blade airbox concept of 2010. Lets wait and see what they have before questioning the fabric of the team and its principle."I think we're about a second off where we want to be, and where we want to be is mixing it at the front. So we've got to find a second in the upgrade, which we think we can do but you never know what the others are going to do as well. Everybody's going to have new bits at Barcelona.