Here I am posting my own investigation. Out of his 5 games, 4 are old and 1 is still very new.
France+Germany having nice time fighting England in the following game.
http://www.webdiplomacy.net/board.php?
gameID=12457#gamePanel
Russia+Austria having very good cooperation fighting England. AlexMc(feeder) just helped Outc4st(main account) gain Kiel! I think in this game Russia should be fighting Austria!
http://www.webdiplomacy.net/board.php?
gameID=12388In the following game England+Itay(Outc4ast+AlexMc) crushed France who was unfortunate to be in the middle.
http://www.webdiplomacy.net/board.php?
gameID=12389This is the game I am in, he just defeated Germany's last army :( and now only I am left. The feeder account AlexMc(france) is wishfully undefended while he have the army to defend well, same time Outc4st is well prepared to "Backstab". In his winning turn, he will "backstab" his ally to show the world he is not double account.
http://www.webdiplomacy.net/board.php?
gameID=12390If anyone looks at the old maps of these games, you will see there was MANY cooperative moves.
And lastly take a look at the last 3 game links, their game ids are sequential! Meaning he made the games to do what he is doing!