I am 100% sure the Mavs would have done the trade for just the trade exception. I believe the Knicks wanted a pick to facilitate since they did not need to do a sign and trade. It?s possible they wanted a 1st and Mavs told them to F off. JB could?ve done the team that drafted him and gave him a chance to shine under two different coaches and secure $100m deal a solid. But he didn?t. So F him.
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