In my view this, as well as the unfulfilled expectations regarding Walker and Williams--or Mercedes Russell--indicates how difficult it can be to evaluate accurately high school players in a way that predicts college level success. There are just so many variables: ability to grow, commitment and work ethic, coaching (and the ability to respond to it), team fit, basketball IQ, etc., etc.
It's certainly true that more players ranked 1-10, say, go on to have really impressive college careers than those rated, say, 40-50, but it's also true that a fair number of players in the first group never meet expectations (around 40% in the Hoopgurlz rankings I've looked at recently) while a Ryne Howard (#32 Hoopgurlz) flourishes. (I think she was ranked around #18 on Prospects Nation, which also indicates how much leeway there can be in these rankings.)
Or, closer to home for me, Oregon's Ruthy Hebard was ranked #40 and Satou Sabally, a junior like Walker and Davis, #36. (There was a Sabally/Walker argument similar to the Davis/Walker one.) Ionescu was ranked #4--fair enough since two of the players ranked higher have certainly had fine careers (Cox and Dangerfield)--but Joiner Holmes at #2 (she was actually ranked #1 that year by two services)? I'll stop with that.