He's probably better than Frimpong, less likely to get a red card, and meh, I don't think it will make a difference. This could be embarassing, and with Song in defence, in a game like this, I'd honestly not want to risk Frimpong and Song on the pitch in a game like this.
Where are we on defenders, I can't for the life of me remember now, Verm is out, Kos got injured, Djourou and Squillaci, has Wenger just stopped pretending they are defenders, or are they injured aswell, what about Miquel, he's better than Song, if not brilliant.
Considering how a greek side who are woeful away from home gave Song/Mert the run around, and Spurs are a considerably better side, meh.
Also AOC, not brilliant but one of our best players in the past few games, doesn't even make the bench?
Its Arsenal, and Spurs, neither are consistant, both can have truly awful games out of nowhere, but if both teams play in general as well as they have all season, Arsenal are going to get thumped.