It's never fun to be the team on the couch as the NBA playoffs ensue. That's the exact situation the Los Angeles Clippers find themselves in, after they suffered a tough loss to the Golden State Warriors in the NBA Play-In Tournament. An uncertain offseason lies ahead for the Clippers. Several key contributors are free agents, including John Collins and Bennedict Mathurin. Trade rumors continue to circulate about Kawhi Leonard, despite LA's persistence in building a competitive roster around Leonard and point guard Darius Garland. While free agency is still a couple of months away, it's never too early to look at potential targets for LA to improve the roster, and a familiar face stands out among the list of free agents. Clippers Should Pursue Isaiah Hartenstein There is a bit of a caveat here with Isaiah Hartenstein. The 7'0" center has a team option worth $28.5 million that the Oklahoma City Thunder can choose to keep or decline.…