2 million for a player who belonged to you!! A player who's future was West Ham's choice!!
Kia has given you this bit of piecemeal just to stop you playing silly buggers and delaying the inevitable.
It's a bit like borrowing your mates sports car and when he wants to sell it you won't give it back unless he gives you some of the money.Just because you drove it a few times does not give you the right to a share in it's value.
West Ham simply stuck a spanner in the works and became so annoying that it was easier to bung them a few quid to get rid.