One of the things I found dissapointing is that you can't use categorical colouring in a treemap.
However, because it is possible to put a non numerical value in a continous colouring scheme (in this case UniqueConcatenate([Team])) I thought it just meant a bit of work to enter all the values. However, when you look at the treemap in the attached file, you notice that the colours don't correspond to what is in the legend (I didn't put all the teams in yet as soon as I noticed this problem). For example Arizona is green in the treemap and blue in the legend. Atlanta is orange in the treemap and green in the legend.
I could get around it by using First(DenseRank([Team])) as a colouring expression (as can be seen on Page(2), but then the legend doesn't show the team name.