Hello. This is very important for a league I am in. I tried some basketball boards, but was unsuccessful and know the people in here are far more intelligent anyway

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The Nets have only had Kidd for 2 years, so he does not qualify for the Larry Bird exception. They will also not be under the cap at year's end. However, they will be able to resign him if Kidd so desires. What clause or rule allows the Nets to resign Kidd this offseason?
If we don't know what specific clause, any place I can find this out? My league apparently is modelled after the NBA salary cap and all, but suddenly they say I can't resign Kidd this offseason because I'm not under the cap. Thanks.