Board Thread:Naruto Discussions/@comment-26773508-20150905054531/@comment-5936871-20150905151505

@Ravenlot 27 Minato wasn't compatible with Kurama, so he couldn't have become a Jinchuriki anyway. You need to have special kinds of chakra in order to become Jinchuriki. Minato's body could barely handle half of Kurama's power without experiencing severe pain and going numb, while Naruto had no problem holding half of Kurama's power as an infant because he inherited his mother's compatible chakra.

Who else was a member of the Uzumaki Clan in Konoha who was compatible with Kurama? No one. Who else would be there to use sealing chains to restrain Kurama when he resurrects if Kushina dies? No one. The only choice Minato had was to either seal Kurama back into Kushina, believing Kurama would die with her. Then resurrect and come back and cause havoc, or seal it into his son so his son could use it's power in the future to combat the Masked Man. He used the RDS because from the looks and sounds of it, that was the only sealing jutsu that allowed him to split Kurama's chakra in half and give it to Naruto, cause Naruto couldn't hold all of Kurama at that time.

Thus, Minato sealed the other half in himself and allowed both his soul and the other half of Kurama go with him into the Shinigami's belly. While sealing the remains of his and Kushina's chakra into Naruto's seal so that they both could reappear inside of him when the time is right to help him restrain and then learn how to control Kurama's power.