There were US judges at US nationals and ISU judges at 4CC. Of course there will be a dropoff from US Nationals to 4CC, as Nationals scores are always inflated. But why should there be a dropoff from 4CC to Worlds in Tokyo?
The ISU judges at 4CC for the men's event were from AUS, AUT, BUL, CAN, CHN, FIN, GER, ITA, JPN, SVK, SLO and USA and the technical panel was from BEL, JPN and SVK.
The judges for Worlds will include judges from BLR, BUL, CAN, FRA, GER, GBR, ISR, ROM, RUS, SRB, SVK, SLO, RSA, SWE, SUI and USA. Interesting, the Men's panel will have no judge from JPN (but possibly the Referee will be Japanese).
I don't see that there is going to be all that great a difference in the scores given for elements based on the composition of the judging panels from 4CC and Worlds.
A 10-point dropoff? Only if there is a big drop in performance level.