I feel badly after Topeleven update its grouping strategy last time. I think I am good at changing formation and tactics, so I can win a league with relative weaker team. But this will be a disaster for the next season, in which I am nearly the weakest team in the league, and any formation or tatics will not be effective. There will be a bad experience throughout a whole season. Therefore, I suggest you not only consider the ranking but also take into acount the team quality.