90% of pre-season HS rankings are bunk. The only ones that mean anything are for teams that were good last year that return a lot of key players.
To your point about Castle…anybody who watched their scrimmage against Memorial would be pretty skeptical of them. Granted, it’s a very limited sample size, it’s very early in the season, and coaches aren’t calling a game as they would in the season. But, still, they didn’t look very sharp.