Not sure why they didn't wait and test a TP vs. PP car.
Who's to say they won't in the future? The '14 is owned by a writer at AW, so it will be available for future comparos. In contrast to what others are saying, that the non-TP GT did pretty well against the fastest '14 GT available is pretty impressive and sets the stage for a subsequent comparo with a '15 GT+PP.
I think it would also be great if AW or another group of journalists were able to compare a '14 GT+PP, '13 Boss LS, and a '15 GT+PP.