What was up with SEGA assigning tons of different manufactur

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What was up with SEGA assigning tons of different manufacturers for it's production of the SEGA Saturn?
Seriously even the legendary stinker FUNAI produced HST 3210 models.

Also rather interesting subtle changes between the models, I had no idea HST 3200 had those ventilation holes on the sides and that the LEDs on the HST 3200 are bigger than on the HST 3210. HST 3210 internals also seems to overall resemble the what we call the Model 2.

http://nannanseisaturn.web.fc2.com/segasaturn/
http://evilboris.sonic-cult.net/saturn/index.php