If you one retreat and lose a key point in 4vs4 then one has to a long time to contest it again since he will probably need a leig and RW.
If being forced to retreat and lose a key point in 4v4 at the beginning of the match is so important then UKF obviously suffer more from it since they are "defensive faction" and thus have lesser option than okw when it come to regain territories.
On the other hand, as okw, one not only can counter uc troop without too much difficult, but also can come back from losing to it easier as Ukf have a number of well known weakness in the mid game and okw happen to have all the tools to exploit them.
Edit: add 2nd point.