There have been some very talented 14u local kids that attended PG showcases, their grades were around a 7. This isn't to say they aren't talented 14u players but when being compared to grown 18 year old men it's hard to compete to get a good projection grade.
I personally know a 2016 who attended his first PG Showcase December of his Freshman year, he got a grade of a 7.5. He attended December of his sophomore year and received a grade of 9.5! He attended another showcase December of his Junior year and got a 10 and the D1 offers rolled in. He attended 2 more his senior year.
He said he did so many showcases to get his numbers down, that he would go in with a plan to focus on his pop, or focus on his 60 time, he always had a plan. On his main page his best pop time is from 2013, his best outfield speed was 2016 and his best 60 time was 2015. Going early didn't seem to hurt this kid because it showed he improved over time and the final picture showed he was VERY capable.