Why can't we just think of All statements the same as conditional statements? Is the negation rule for both also essentially saying the same thing?

For the option 3 where "or" actually means "and", does that mean "Jane is a faster eater than either Mary or Jon" = "Jane is a faster eater than Mary and John"?

But "Jane is a faster eater than either Mary or Jon" /= "Jane is a faster eater than Mary or Jon"? ... where this now becomes option 2 usage of "or"?