Chief would shoot kratos in the teeth then move on to his next mission. Kratos will be too easy for chief. Sure kratos killed gods blah blah. he has never faced a gun before. One shot and it'll be all over. Sure he'll just come back from hell to get his revenge, but by the time that happens the chief would be on the otherside of the galaxy fighting something else.

MC. Either through extreme awesomeness or insane luck. You choose.

Kratos