People love to talk about championship windows closing and opening, but the reality is always a bit more complicated. Few realized that the Thunder’s championship window was already open last month, and even fewer thought the Mavericks’ house had any windows at all. The Lakers, until two weeks ago, had a wide-open window (at least for this season), the Magic cracked one open unexpectedly two years ago and the Spurs pried open theirs again this season.