Any experienced player has an affect on the game. When they team up and work together that is amplified, but is also part of the game. The same can happen when random players work together.
What can help to balance things (and has been done in many games) is trying to put an equal number of predetermined squads on each side (odd numbers will of course skew that and nothing you can do if only one joins).
Remember though,. not all squads are going to terrorize the other team. Just because they are a clan or pre-made squad does not mean they are any good. On BFV, I joined my grandson and a couple of his friends a few times. Their impact was more to the detriment of their own team.
Unless you bring in the hated skill based matchmaking, it is always going to happen (and as COD proved, will happen anyway).
