The sponsor's stake
You don't apply. A man already in the Row sponsors you, and his sponsorship costs him something real: he stakes a tally on you. If you wash out inside your first year, he carries a tally for having vouched wrong. Skin in the vouch. Nobody brings in a body to fill a chair.
Growth by fission
A row stays small by design, a select group of chosen men, no more. When a row is full and true, it can found the next row, its own chosen men, its own copy of the charter, one veteran to carry the culture over. Growth by fission. That part gets built slowly and carefully or not at all.