The only missing thing in Alan Rickman was that he was too old for the character. Other than that, he was perfect. The inly thing Papa Essiedu has on his favour is his age, the rest is totally wrong. His face is too sweet and full, Snape is supposed to be waxy pale... The hair can be fixed with a wig, but no, no, no.

Changing the imprinting of Jacob on Renesmee would change a major plot point in the fourth part of the sory, since that is what saves her life when Sam’s pack was going to eliminate her.