Yea, the minimum stamina stuff gets on my nerves. I see it on sledging boards and on JFW, they're like if your openers aren't respectable stamina the sky is going to fall in, all-rounders need at least strong... gawd, they're just as daft when they're on about one-day staminas as well.
Anyway all my main contributors, except Lisbie who I can just use as a batsman if needs be, should be at least competent stamina by the time the FC games come. The other fill in players don't matter so much as they'll bowl/bat less anyway.
The 3 secondary level = 1 primary level thing was just my observation of how my players played, I expect it'll be different for FC games and is maybe why the secondaries take so damn long to pop now.