The one defining moment for the Boston Celtics last season was when they acquired Isaiah Thomas at the trade deadline. Before bringing in Thomas the Celtics were in constant flux, with no idea who may or may not be on the team when they woke up the next morning.
Once Thomas came in, things settled a little bit and the Celtics finally find their groove. The Celtics established immediate chemistry with Thomas and they fought their way to the second best record in the east during that time and an unexpected birth in the playoffs.