As this game will not allow the a player to be placed between the goalie and defense, then DMC is the only close thing. It is as close as you can get to a 5th defenseman without playing 5 at the back.
Liverpool plays 4-3-3, as does Barca. You can call it 4-5-1 if you want but at the end of the day you are being a bit too picky. As a Liverpool fan, and I'm hardcore as I watch EVERY game, I think you need to watch more Liverpool games to tell me that they play 4-5-1.
Get Brendan Rodgers to call me and tell me he plays 4-5-1 and then I will believe you. Otherwise, I will go with what I see and what the commentators tell me. Sorry, I just have to laugh when I hear someone tell me how my own team(liverpool) plays. With Rafa as gaffer and Torres on the team, they played a 4-5-1. He was always screaming for true wingers and tried to convert Kuyt and could never find a consistent left winger to play his formation properly. Meh, I'm just happy that Rodgers has them playing a very exciting offensive formation and the players are buying into it.
I think what you should be saying is that 4-3-3 can quickly transform into 4-5-1 and vice-versa to accommodate an offensive or defensive need, depending on the opponent.