The rules are pretty clear. A position player with only one or two seasons and both fewer than 400 at bats (not PA!) is ineligible. For Archdeacon, you'd be guaranteed his 1924 season because '23 and '25 are ineligible. A starting pitcher with 1-2 seasons both under 100 IP would be ineligible (Danny Salazar, e.g.). Showboat should be valid. His first and last were '23 and '32, and '24 is not in the WIS database. His 1930 season should be eligible.