The Fantastic Four ... Steps has four ‘villains’, it’s more than overkill and could repeat a major mistake that Sam Raimi’s Spider-Man 3 made when it tried to balance Green Goblin ...
The Silver Surfer is absent from The Fantastic Four ... create a different dynamic for the Fantastic Four to deal with compared to the gigantic villain they're tackling in Galactus.
Marvel Comics With The Fantastic Four: First Steps set squarely in the ‘60s, a Russian Cold War villain actually works. We don’t think he’ll be the main antagonist, as we know that’s Galactus.