Just had an idea pop into my head and i don't know if its been asked already
how about the idea of stat gains get influenced by win lose ratio
as in:
a guy who farms wins and is currently 75/35
stats like attack and power greatly increase but def and initiative grow very slowly
or guy farming losses who's currently 35/75 gets a great bonus to def and initiative but slowly grow in attack and power
and a balanced person like 50/50 <or 40/50 50/40 > stats grow moderately together .