I expected that to be the case. To answer your question, just two were lost in the last three years, none in 2023. Once in a blue moon, a John Brebbia emerges, but the vast majority of the time, the minor league phase is full of role players.
I don’t recall if you have a copy of our Prospect Guide, but all the Cardinals Rule 5 details back to 2002 are on pages 258-260.