Firstly, we clearly don’t have the money to buy everyone we need, so if we buy a younger upcoming CB, we will have to sign free transfers in other positions, probably CM.
Secondly, we may have no budget at all and be relying on sales for any purchases.
Thirdly, Tarkowski is available now on a free and he won’t wait while we decide whether to go for him. It’s now or never.
Fourthly, there is no particular reason why his performances should drop after two years. CB’s generally have a record of playing beyond 34. It is a gamble, but do is signing a more expensive youngster.