Hmm, well having looked at the replay there doesn't seem to be quite such a simple correlation between garages and boxes. Unfortunately a whole bunch of people moved out of their boxes and went to the end of the pit area before they needed to.
If the garage theory is true, Martin and Gerald should've been sharing, as should Pablo and Bernie Lomax. It appears that Martin was shuffled foward into TT's place, TT into mine, me into the next and so on. I'm sure there's a pattern but I suspect that it doesn't really make any difference, the end result will always be that at most tracks people will end up sharing the boxes.
In the next version of the skin/ballast pack I plan to remove all the PitGroup codes from the ballasted cars so that the pit space allocation is done in a completely uniform way.