How many of the raw athletic guys that struggled like this made it eventually? Who?
I'm probably biased to the Jays system, but just thinking of guys like D.J. Davis and Kevin Ahrens, never turned it around or came close the majors.
On the other hand the high draft pick teenage guys that did make it to the majors, Snider, Guerrero, Bichette, Lawrie, Vernon Wells, they all creamed low A even when they were 18 or 19.
Keen in mind while "young" Nimalla is at the same stage career wise as Bo Bichette was when he hit .384 in low A at 19. Nimalla is "18" but really just 7 months younger than Bichette, and same stage of "development" (year 2)