FWIW, I don't know if this is really true. He was never ranked in any of the "big 3" lists, despite being eligible for such lists for 6 years, up until his 24th birthday. The Yankees promote aggressively at times, but Nunez basically repeated both A and A+ levels, and spent full seasons at AA and AAA before debuting at age 23. He was pretty consistently a .260-.280 hitter, 90-something wRC+ hitter throughout, except for a .322 AVG, 116 wRC+ blip at AA. Not a bad young player, could become a decent starter for awhile, but not really a "hot prospect". I think he just got a lot of attention from the Yankee hype machine for a bit -- Nunez's .322 season at AA just happened to immediately precede Jeter's first big decline year (.270 AVG, 90 OPS+), leading to a lot speculation about him taking over the position.