The Golden State Warriors probably need to make a trade this offseason to improve their contention chances. One of the most common reasons to trade a star is playoff disappointment. Eight teams just lost in the first round of the playoffs, and each is a facing a different level of disappointment. For example, the Trail Blazers and Raptors are probably less disappointed because they had their best season in a few years, whereas the Nuggets and Rockets are more disappointed because they had true championship ambitions. I picked out three players whose teams might be more motivated to make a trade. Honorable Mention: Kawhi Leonard Leonard wasn't eligible for inclusion because the Clippers didn't make the playoffs, but he fits the general sentiment of a star who could be looking elsewhere after a disappointing end to the season. The Warriors tried to get him at the trade deadline, and there's reason to believe the Clippers will be more motivated to trade him this offseason.…