(pls no harassment) Am I the only one that thinks that mangle caused the bite of '87? (and 83 was incident)

Title, pls no harassment this is just a question to the whole community.

My theory is that 1983 there was a fredbear incident that the child survived and 1987 the actual bite of 87 happened as seen by mangle's quest.

I see that a lof of people are 87'er and that cannot accept my theory at all.