Each February, when the year’s shortest month transitions us from winter to spring, mild-mannered Celtics president Danny Ainge morphs into Trader Danny. This swashbuckling alter ego ups his phone call frequency in preparation for the NBA trade deadline, which this year falls on Thursday, Feb. 20, at 3 p.m. The Celtics have not been shy this season in terms of making deals, but the deadline offers a more urgent environment in which to do what Ainge likes to do best. Celtics blogger Gary Dzen has identified nine players on the current roster who might move in a deadline deal. He offers his take, and we ask for yours on whom the Celtics should keep or trade.