Do you interest to know how much DEC reward/winning battle for each rank? Here you are.
Below is the formula i use to calculate Base DEC:
Base DEC = Get_DEC / (Bonus%+100%) / CR%
as:
Base DEC : The base DEC you will get if your capture rate is 100% with no bonus added
Get_DEC : The actual DEC you get after the battle win
Bonus% : The DEC Reward Bonuses (Win Streak + Gold Cards + Alpha/Promo Cards + Guild)
CR%= Capture Rate