The 2016 season saw the league grow from nine teams to a total of 28 announced teams. However, only 21 teams ever played a league game that season, including four teams that folded midseason and several other teams cancelling scheduled games. The Columbus Lions, which joined for 2016, would finish the season undefeated and win the championship. The Lions then announced that they were leaving the league due to the league's instability, especially in the Southern Division where the Lions were the only team that did not have a cancelled or rescheduled game. On July 7, 2016, the Lions' owners announced the formation of a new league, the Arena Developmental League. On July 13, the Lehigh Valley Steelhawks also announced they were leaving the AIF.