A bit confusing. Must be doing something wrong. PB Viz defaults to Skenes 0-0 count FF. Took a bit to realize I had to manually add all counts. Flip to "Overall" and get 55.5 grade. Look up the same info on his FG player page and he didn't have an Overall grade below 60 on ANY of his fastballs.
It's a long story related to the fact that PitchingBot overall grades are count-agnostic, whereas we have to change that for the individual count grades. We settled on sticking with the unweighted ones, which have the most predictive power - but if you weight by counts, there's a bit of noise