The Rendon comparison had me intrigued, and is a little more apt (first round draft pick).
Both these guys were born in June.
Both drafted the month they turned 18 (Turner 602, Rendon 820)
Both drafted higher 3 years later (Turner 13, Rendon 6)
Rendon did 44 games at all levels under AA, flowed by 54 games at AA over 2 years, 3 at AAA, then he was up less than 2 years after being drafted, before he was 23.
Turner has already done 78 games at al levels under AA and 11 at AA. If he starts next year at AAA he's ahead of Rendon. If he gets there this year, he's ahead of Rendon. If he shows up next year after a couple months in the majors and OPSes even .725 while he gets settled in, he is Rendon.
You guys are right. He might play next year. But not on opening day. That'll be a guy whose name starts with "Es".