Where did this lie come from that most of the staff is in Asobi? Yurinka is very disingenuous about this, so I hope it's not from them you take this information.
Asobi has less than 70 people and around 20 - 30 people or so were transfered over from Japan Studios.
Asobi was a studio within Japan studio. I feel like people keep forgetting Japan Studios was a hubris of studios
Most are gone. The studio was gutted.
Team Gravity is now Bokeh Game Studio.
Team ICO is now Gen Design.
Team Asobi remains was basically a small team within Japan Studio which worked on the Astro stuff.
Polyphony digital became a separate Sony studio after Gran Turismo became successful.