I created a new Historical Simulation in 1969 and there were only about 7 minor league players for each team.
x Import complete history up to 1969
Optimize for Single-Season Replay
no real historical transactions or lineups
x Triple A
x Double A
x Class A
x Short Season A
x Rookie League
unchecked Require full minor league rosters
kept standard defaults on the Historical Career Play page
kept standard defaults on Scouting and Facegen page
Play as GM and Manager
start year 1969
Select a team to managed
I selected the A's and I also previously selected the Cubs.
Only 7 minor league player exist for the A's
Only 6 for the Cubs