As I remember it, 5m was his release clause, so they thought they had stole a march on everyone else and were smart. As the clause was so low, they gave him massive signing on fees and wages, which is why they cant shift him now cos:
a) he is shite
b) he is shite with a long contract in his pocket
c) he is shite, has a long contract in his pocket and massive wages
d) Did i mention he is shite ?