I don't know how this happened, whether it was initiated from the side of Jackson or from the management side. Giving a player like Jackson which I consider as average a contract of 8 years is outrageous or strange to me. It is also a risk to Jackson because he could be lucky and become a world sensation, then moving to a better club would be a problem.
Anyways, I'll need to know the clauses of this contract; the wages and the release clause before I'll make a better judgement.
Chelsea football club contract extension doesn't make sense to me and we don't know why they do this but they have their reasons. Jackson is said to have done well in the eyes of the club owner therefore the contract extension was a reward for his performance last season. While we didn't see anything that Jackson did, the club saw and thought it'll be good they extend his contract. From this new wages, Jackson should be performing better or he's going to be benched when Chelsea get a new striker. Jackson doesn't have any plans of leaving the club as no club will want him with the way, he's constantly missing chances created.