Getty Brad Stevens, Boston Celtics When the Boston Celtics acquired Nikola Vucevic via trade on Tuesday, Feb. 3, they ducked under the first luxury tax apron as a result. The Celtics are now just $6 million over the tax threshold. They could make a smaller deal ahead of the Feb. 5 trade deadline in order to be a non-tax-paying team. And while that achievement would mark a mission accomplished for Brad Stevens, the flexibility the Vucevic moves give Boston on the buyout market could prove