Board Thread:Dragon City Gameplay Questions & Answers/@comment-24964189-20140522095927/@comment-24687553-20140522134831

If you leave behind a weak team, your opponents in the same league that you're in might have an easier chance to progress through and move on to the next league. This can be useful if you are having a hard time trying to defeat  a high level opponent in the same league as you are in. After that opponent moves on, a new opponent which might be easier to defeat will take its place. So you might end up having a higher chance of progressing to the next stage if you're stuck with  a difficult opponent.