Using a single male for a whole seed run is the quickest route to a narrow, inbred line, which is fine for a few generations but eventually costs vigour. Population breeders prefer to let three or more selected males pollinate together so the offspring keep some depth. Guidance on picking a male count based on how many seedlings you started with is available at https://breederregularseeds.com (https://breederregularseeds.com) and the numbers are lower than I assumed. For a hobby project two decent males is a reasonable compromise.