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I present あなた the ultimate proof that Jack actually caused the incident.

First thing's first:Let's Review The grandfather Paradox for those who don't know it.

"Say あなた invent a time muchine あなた go back in time and accidently kill your grandfather before he meets your grandmother then あなた would have not been conceived therefore あなた don't invent the time muchine and あなた don't kill your grandpa so あなた are conceived which Allows あなた to invent a time muchine and kill your grandfather again so あなた will be stuck in an endless time loop"

This is the same deal"The incident happens in 1977 which leads to...