Why was Sandy (long hair victim) in the film?

After watching the film, I was still wondering why Sandy Mardell was written into this film. He was one of the main gang, but wasn't even addressed when Bean told them to disband, and he left before the final conflict.

He had no connection to the main plot, apart from being a victim of crime. Surely just there to make up the numbers.

(Although as far as relevence goes, Bean had an axe to grind simply because his wife was with another man, and Danny Dyer because he was beaten up once, not to mention having a premonition which would never happen in reality. Munroe made sense because his wife and baby were killed and the secutirty guard because he was convincingly bloodthirsty. Maybe I should just take the entire cast with a pinch of salt. The acting was good though on a positive note.)