Looking at their roster to begin the season, I felt that the Clippers were pseudo-contenders all along. Their ceiling was the WCF, even after their midseason additions. They were never good enough to beat OKC or San Antonio in a 7 game series. Not enough star power. Blake Griffin is overrated (but improving), and CP3... well, his shortcomings have been well-documented.
Even the greatest coaches can't lead their team to a title without adequate talent on their roster.