Board Thread:Questions and Answers/@comment-33907931-20180719131636/@comment-32271305-20180719143732

Most teams have certain hard hitters that want to be paired together as often as possible, so that they can activate their best Link Skills and their full potential. By putting a support unit in the first slot, you might miss out on that and cause less damage overall, since your hard hitters would be separated, as the unit in the third slot always comes back one turn later than the other two.

But in the end everyone is free to play however they want, and if the enemy would completely destroy the support unit in the third slot, then it wouldn't be such a bad idea to avoid that.