It doesn't have to be bad player evaluation. Sometimes bad/ok things happen with good people and good methods/intentions.
This blame-seeking is an annual occurrence even in very good seasons. I don't really get it.
But to respond to the rest of your comments, Turner definitely got a lot better from his freshman to junior year so while lots of credit goes to him (and maybe a proportionate amount of "blame" goes to the current seniors unfortunately), some goes to the staff as well. If Lighty and Lauderdale were on this team instead of Amir and Trey, we would be a much better team. Not sure why you disagree with their quality/development as college players. Both were plus defenders/rebounders and Lighty's offensive game developed a ton. Shot 40+% on a large number of 3 point attempts his senior year and was a good slasher. Lauderdale was terrible outside of a 4 foot circle around the basket but amazing inside it despite being an undersized center.