First, the Millstead kid transfered from another Catholic school to this one. I believe because his parents moved closer to Aquinas. The other two, Markey brothers, were at public middle school that had k-9th. They wrestled for Olathe North since the school was in their district. Why they didn't start at Aquinas until their sophomore year is a question you'd have to ask them.
I do not believe this is due to recruiting. Parents and kids ask other kids/friends all the time to come to the school. Is this recruiting?
I think the major factor that Aquinas is doing so well is due to a very talented sophomore class. Which in turn is due to (as someone said) good kids clubs.