Yeah if you add point 3 to point 1, you can effectively add 24 new guys to your organisation within one game month (ST and first game month), you then clear your roster by 10 deadweights, but also don't just pillage the FA pool. So this ensures that there are still guys available.
What everyone has to remember though... just by having guys in your minors, doesn't mean they'll develop, they need game time to develop, so if you overload your minor league teams, you won't get the development expected.