Introducing them in the first movie takes away the impact the reveal is supposed to have because we're just now meeting them.
Introducing them in the first movie takes away the impact the reveal is supposed to have because we're just now meeting them.
Not 100% obviously. They could have come close if they had actually introduced more (surviving) villains in the movies, but that obviously did not happen.
Like, hey, have Spider-Man fight Beetle in a one-off scene at the beginning of his movie!
Moonstone would've been more memorable than Dar-Benn (if executed properly).
The reveal works even less in that context because we'll already know about the characters.