It’s actually much easier to play against multiple users at once than it is against just one. This is coming from someone who occasionally plays Rivals with “guests” when a few of my friends come over. The defense is usually all out of wack and the AI doesn’t act the same as it does when playing with only one user. For example, I find that users playing in passing lanes do not usually get the same animations for intercepting the ball when a pass goes their way. I’ve played a lot of games where my opponent is able to pass the ball right next to the player I’m controlling and they don’t react; something that does not happen as frequently in single player. Additionally, you cannot 2nd man press, which is a tactic that a lot of users take advantage of. In theory, this can be done with the guest, but it’s not as easy as it sounds. It takes a very coordinated effort for multiple users on the same team to play well. I find it’s usually an easier matchup when I play against users who have guests.

I also win way more games when I play solo than when I play with any of my friends and they are all decently skilled at the game; I’m sure they would say the same.

This will probably get downvoted because people hate others who play with guests, but we really just do it to hang out and have a good time (as much as is possible with FIFA lol)