Not sure about that. Even looking past the fact Cisse and him have the freedom to change position in that formation whenever they want, Ba has come into some decent goalscoring positions since his last goal. For various reasons (excellent saves v Spurs and Wolves, missed penalty v Sunderland, hitting the woodwork v Sunderland, being fouled in a goalscoring position v West Brom, bad first touches v Bolton) it's just not happened for him. I don't think the formation is the problem per se.