I don't buy it, but all I can go on is my own experience.
If anyone can take down two people, that goes for your enemy too, so that cancels out making it not easy.
Same with the squads, I understand that it is harder to take down 4 guys as one man, but that means it is easier to win against one if your squad is all alive, so again it cancels out. What you are saying goes both ways, all you have to do is keep your squad alive. Since there are only 20 teams instead of 50 teams, that makes it eaiser to get high ranked...and much easier to pretty much know where people are, whereas with duos and solo it is much more random where folk may be because they are seperate teams/players. The point is it is more random... squads to me is the least random of all the game modes.