Or Rookies Gain STA from playing time than the usual Losing STA from Playing time... Heres some Qoutes from other threads that may help explain it:
(308847.8)
How about rewarding them instead to promote training efforts...
I think in real life... if you push the limits of the young athletic peaple you will help them develope their STA... what doest kill them makes them stronger... So Letting them play probably those under the age of 21 (or even older, whatever you see fit) should have a positive effect on their STA, not the other way around...
(308847.20)PLayers that played very High minutes on their Developing years should increase their GS drop Resistance on their Prime and or make it natural for them to improve STA over time (Just like EXP does)...
Players that are not used to play high minutes from their Developing Years that have been forced to play High minutes in their Prime should not have that High GS drop resistance and should have a slight disadvantage against players described above...
and other situations the BB would see fit...