What could Minato possibly know

[enditallsin]

H knew about maara uchiha and how it was a risk to attack when he had kurama under his control,plus he WAS kage when the uchiha clan was still around in the village,

 

[blazekev90]

I don't know his purpose neither

 

[Owarij]

...Sasuke still thinks Kyuubi was a natural disaster.. and his clan was wrongfully suspected..
Minato is the only one that knows there was a masked man controlling the fox..

iF Sasuke finds this out, his hate will turn to obito