Jazzy Network
Member
War Machine, Widow, Panther, and Vision signed the accords because they believed they were necessary. Tony didn't convince them to, and Widow seemed to support it in spite of Tony. The only person on Tony's side who's there specifically because of Tony is Spider-Man. On the flip side, there's only a Team Cap specifically because of Cap. Hell, Hawkeye and Ant-Man only come into the movie at all solely to help out Cap.
In a Civil War without Tony, you'd probably see Panther leading the rest of that crew against Cap's team. In a Civil War without Cap, everyone would have either signed or just retired (or in Hawkeye's case, stayed retired).
Sam seemed very against signing to me.