Charley Rosen, Phil Jackson’s confidant and his former longtime Albany Patroons assistant coach, believes center has to be the Knicks’ No. 1 priority in the offseason. Rosen, a triangle offense savant, believes Kentucky’s Karl-Anthony Towns, who has growing momentum as the No. 1 overall pick, isn’t the answer as the low-post threat needed in the triangle, but free-agent-to-be center Greg Monroe of Detroit would be a great Jackson pickup.