I think he could end up somewhere between Ryan Braun and Carlos Beltran in terms of production.
I still agree about Taijuan Walker. Phenomenal prospect. A better comparison would be between Trevor Rosenthal and Carlos Martinez (sorry for using cards prospects but those are the ones im familiar with). MArtinez is currently ranked over 10 spots higher than Rosenthal, but Rosenthal has proven he has the ability to be dominant at every level. While Martinez has yet to even pitch 120 innings in a season. I know as a cards fan im alot more excited for Rosenthal than Martinez, mainly because i believe Rosenthal has the potential to be the next Justin Verlander, yet Martinez continues to outrank him on lists. Why? he is about 1 1/2 years younger.