They have more than one team to make games you know. :rolleyes2 They even have some 2nd parties like Level-5.

Final Fantasy IV (DS): Matrix Software (Final Fantasy III (DS), Dragon Quest V (PS2))
Final Fantasy XIII: Toriyama's team (Final Fantasy X, X-2)
Final Fantasy Versus XIII: Nomura's team (Kingdom Hearts series and Advent Children)
Star Ocean 4: Tri-Ace (Star Ocean series)
Dragon Quest IX: Level-5 (Dragon Quest VIII, Dark Cloud series)