No, that is not the case. Usually, when you are hiring a specialist of some kind you do want him/her to identify with the culture, mission and values of the company you're working for, as well as to excel in each and every technical aspect of the job he will be performing. Also, you want to make sure that the new professional get along well with the team, so you do perform some micro-management to ensure the team is coping with the new member well.
Imagine now that you are adding five dozens of people to PD's offices within a month, how do these specialists blend with the existing workforce? How are their tasks organized and set? Who will induct and train them on the adaption stages?
See? That alone takes a lot of disallocation of workforce to train and accompany these new guys until they are a hundred percent at home, and mainly, demand a whole new lot of management to be done. You can't hire specialists in a hurry, the same goes for managers.
Point is, although you did raise up a valid question ( one that I did ask here many times too ), the expansion you're talking about is a huge step, couple that to the quake/tsunami events in Japan and all the rush in delivering new content ( mostly led by Forza 4's debut, I presume ), and that sort of reengineering is quite hard to be done right now.
Sorry for the huge post, I've had some experience in project management in my last two jobs and I just like to share some thoughts on the subject.
I honestly expect GT6 to be an expanded version of GT5, much like GT4 was in relation to GT3. Not much different, only bigger and fixed in some points.