>>94239115Tatsuya Minami (Business), Shinji Mikami (Designer/Producer), Atsushi Inaba(Business/Money), and Hideki Kamiya(Director/Designer) were all the key people in starting platinum. Out of all of them, the only guy left is Atsushi Inaba.
Some of their key directors and designers were:
Kenji Saito (Metal Gear Rising), Takahisa Taura (Astral Chain), Masaki Yamanaka (Anarchy Reign) and Abebe Tinari (Bayonetta Origin). They've all left Platinum Games in the last year.
They've also lost a decent number of junior devs just due to downsizing.