Just a personal opinion,if i would have to test ride some bikes,i would use the same tires and tires pressure for all of them. Very good review by the way.
In the timed runs, the bikes were all running the same forks, DHX5 shocks and High Roller tyres. This is explained in the first or second part of the article as one of the baseline consistencies that we'd agreed upon to ensure that the test was as fair as possible. This was the first day that the bikes had come together and as a result the tyres were still on from whenever they were used last. And, as the testing was obviously snowed out and we were just doing stuff for the camera's, we elected not to change tyres as there seemed little point.
Scotland, United Kingdom 
Very good review by the way.