They are a team that haven't had to tank for several years so players are naturally competitive. The same story this year, no reason to tank so they play to their maximum and want to win every game.
Not many players will have spent all 3 straight 'no-pick' years there but it still helped to build a good culture.
How can they extend Okafor? Philadelphia declined team option so they could have only offered him what he made in his final year there, about $6M. Will Nets be able to offer more? I don't think he is going to receive even that from anybody but if he plays well for the next six months, who knows.