HS players drafted early get that rep. Unless you're in a big market, then post poor numbers and still be top 40.
The ceiling projection changes if the knock on the HS prospect seems to creep in after a season or 2. You expect some body filling out and harder hit balls or HR power to show up, but Warning Track Power(hi) or k issues, it's time for the next draft/int signing class to jump ahead in ranking.
I could easily see Williams as Opening day SS over Ortiz. Like Sproat, being ranked qualifies him for Roy draft pick compensation. So the conversation on Pratt in AAA or AA wouldn't matter. Monasterio's days has to be numbered. If they put Williams on Opening day roster, I'll guess he becomes a late RP trade for a team needing a 3b/SS backup.