Apparently, I forgot the "search by first five letters of surname" rule and thus missed their files because i was looking for "Castillo" and "illo" but not "Castil". My bad.
(But yours were nice, anyhow.)
Back to pure wannabes, after being an All-American 2B at Cal-Berkeley, Jeff Ronk lasted until the 34th round before the Padres drafted him, but put up some sweet numbers his first few years, including that .326/.401/.460 at AA Amarillo in '82. But the Brewers kept him in AA, and he stagnated, steadily declining the next three years until his release.
Here he was taken in the 20th round by the Phillies, and after tearing up Reading (AA, you see) for a month, he's in the Show. Okay, then.
'stached and 'stache-free, your choice.