RJ Barrett‘s extension with the Knicks complicates a potential trade for Donovan Mitchell, but it doesn’t close the door entirely, writes Marc Berman of The New York Post. Sources tell Berman that the Jazz are most interested in stockpiling unprotected first-round picks in return for Mitchell. Berman has reported that Utah wants four unprotected picks in the trade, while New York is only willing to part with two, along with three conditional selections. A league source indicates that the market for Mitchell remains limited, telling Berman, “There’s no place for Donovan to go right now. The Knicks can still get…