Hopefully Logan and Peter will turn out to be the most logical substitute FF members Val and Franklin choose story-wise and not just for a fortuitous reunion of the "New FF" teased in a later issue with Hulk and Ghost Rider.
Peter definitely is, as he took Johnny's place on the team before when he was thought to be dead and is one of the team's closest friends in the wider superhero community. He's also Franklin's favourite hero outside the F4 themselves.