Eddie could've been saved in 3 which would introduce Carnage
I reckon had spider-man webbed Eddie to the ground he could've saved Eddie when he pulled Eddie away from the symbiote, I think that he had enough time to pull him free and web him up then pumpkin bomb that symbiotes ass. Doing that it would be easier to use Eddie for no.4, he's in Jail and he's in a cell with Cletus, Eddie gets busted out of Jail by the symbiote which leaves behind it's the carnage symbiote which bonds with Cletus...that way you get the original way of how Carnage was created 😄