Just look at those series that the Rockets were eliminated, the opponents were all switching him out to toying him around the three point line, and he had grown nothing in the offensive skills, and he isn't a great smart tower liked Gasol Brothers, Noah, Jokic and Nikola Vuiecic that could set screen smartly or even set play by himself; also, he isn't a great shot blocker like Gobert, Howard, DAJ, etc. He always look good but not great, but he just never reached the expectations from the Rockets that they wanted him to grow (at least some skills on scoring) Of course, all we know other reason is Mike D'antoni and Morey both are crazy experimenters of money ball...