I am not sure how much stock anyone puts into those comparative measures but my guess is not a lot. A year is a long time for a 15 or 16 year old. My son was last at a PG event in July 2019, the FB speed he posted there was in the 89.23 percentile when 2019 closed. If he had done an event later in the year he was throwing consistently 4mph faster in October/November. That would have rated in the 97.90 percentile for 2022 pitchers in 2019.
That begs the question, should you target an event late in the year to post the best number you can for such percentile comparisons?
I don't put any stock in those numbers because I know first hand that it's a random sampling. My son has been to a total of 1 PG event last June where there was a gun, and it was like 92 degrees that day and he was sluggish. Actually had a gutsy day...pitched well but threw slow. So when you research him, it has him throwing in the upper 70's. And there's no hitting stats for him. Meanwhile he's currently at 84mph, and will likely be 86-87 by summer showcase season. For hitting, he's 91 off a tee and 95+ soft toss. It's about as night and day as you can get from those numbers just under a year ago.
One of the few positive take aways from this whole thing is that video seems to be a more important element in the recruiting process this year. Coaches kind of have to rely on it, and the prevalence of tools like Pocket Radar and Diamond Kinetics make filming and then distributing that tape, either directly to coaches or via social media, so much easier. And far more acceptable it seems. Of course it won't substitute for coaches seeing a kid play live, but at least it provides evidence of progress in real time should an athlete be proactive about matters.