But, according to Bungie's stuff, Chief got his mental issues because of seeing his teammates and friends dying all around. Cortana seems to talk about him being the last spartan at the start of 3.
[ Honey Bungie isnβt in charge of the games anymore.And Cortana never says anything about John being the last one.Her entire staring quote is as follows:"They let me pick, did I ever tell you that? Choose whichever Spartan I wanted. You know me. I did my research. Watched as you became the soldier we needed you to be. Like the others, you were strong and swift and brave. A natural leader. But you had something they didn't. Something no one saw... but me. Can you guess? Luck. Was I wrong?"













