I have a feeling that Jyn’s father intentionally put the exhaust port on the Death Star. After all, he seemed reluctant to make the plans in the first place, and he has a direct link to the rebels.
This video sums it up way better than I ever could.
its a fun theory, but no. it took the rebels some analyzing of the plans to find the weakness, it wasn’t handed to them. also, every fan theory is wrong, so there’s that too :p (it is a neat idea though)