How is that when, even after all the injuries, he wasn't even part of the rotation. With Murray and White healthy he probably wouldn't even be part of the rotation right now.
You really think a few games led to such a dramatic shift? They obviously had it in mind in the off season. As someone who's followed the Spurs for some time, you should know that Pop often starts the following season how they generally played the previous one (which is predictably why Gasol started and Forbes got the initial nod over White in the first preseason game).
If Murray and White were healthy, Cunningham/Gay are probably 50/50 to start at PF, with the other backing up and Bertans is probably out of the rotation.