He did nothing wrong. Most likely found out he wasn't ready for advanced and dropped back. Being young there is no hurry. Confidence is important, it's hard to win without it.
As much as it pains me to say it, like any stopped clock, Peabody is at least sort of right. You aren't supposed to go "backwards" without extraordinary circumstances and agreement from experienced CDs or PAMPA EC members.
It *is* different at the NATs, given that there is only Advanced and J/S/O and no official BEG/INtEXP. This illustrates a problem we have had from the very beginning, specifically, the advancement rules are *voluntary* with very rare exceptions, but are frequently "forced" advancement rules applied locally that force people up involuntarily (like win one contest in Advanced with a score above 500, and you are "automatically" advanced). Typically you have 50-75% of the entry in Expert, almost all the rest in advanced, and occasional beginners and intermediates. That's heavily broken and is inconsistent with the intent.
It has the biggest effect in Upper Advanced/Lower Expert where good local Advanced fliers are forced into Expert (prematurely in my opinion) and then get lost when they get frustrated.
The advancement rules were intended to be voluntary but one-way. To me, it is clear that the skill class rules are hopelessly broken by peer-pressure and "forced" advancement rules, with everyone packed up into two classes. I have suggested a few potential fixes but they haven't really resonated with many people, and a lot of people have no idea what the rules say now, despite having been mostly unchanged for nearly 50 years. It certainly doesn't affect me personally, so, I have dropped any notion of trying to fix it officially. It's going to get fixed anyway when the CDs start doing largely as I suggested by combining BEG/INT, just to save buying trophies that they later throw away.
Brett