St Anthony's will keep much more on the freshman team but playing time is a much different story.
If you your son is concerned about his chances of making the cut at Chaminade... Use the club team as an early indicator.... If he plays, and competes well on the A club tourney teams (express , TB, turtles, outlaws etc) he should be fine. If he is playing B in 8th, he will either need to get bigger, faster or improve his skills to have a real shot.

The level of competition is fierce