My thoughts
I think that anyone that can kill as much people as these guys did could'nt be that retarded.But what you said about Jason is very accurate.He died when he was a child...came back and so therefore he still only knows as much as a child.It makes perfect sense.But what I wonder is why he looks sooo mentally retarded when he takes his mask off..
Micheal_Myers
Personally it would be boring when you think about it...they would see eachother....and then wakl at eachother to fight!...but Micheal and Jason are both soooo slow that it would take up half the movie if they didnt cut it or put some stuff in beetween it...like conversations beetween victims...