If you want I can show or bring more screenshot about tons of illegal formation and they are doing good. Look following screenshot, rank 5 club won 5 out of 9 match, even rank 3 club lost with him. My 2 clubs were in that league, he offered me friendship and I keep watching his all game then I see what he doing, he playing with odd formation. You can see last 2 match he lost that was with my own 2 clubs and it was not that easy game to win against him.
When I try to play the same formation, the big red exclamation mark appears LOL which kind of put me off. I'll use it in assoc match and see how it goes.