wait how is this situation of holding bfb an overall net potency decrease

if you get the same amount of bfbs in a fight, then isn't it only affected by on which part of your rotation you're using bfb on? isn't it then better to wait to use it at the part of the rotation with the most +potency if you know for sure you won't lose a bfb?

wheres the net potency decrease coming from

lets say that you can only get 6 dfds in t13 as it lasts shorter than 12 minutes, then you got like a sub 2 minute window to delay dfd in that fight and not lose any dfds. Even if you're only hitting one target ever, it's still a dps increase to delay dfd so that its being used during bfb if you know that all the delays combined won't lose you 1 dfd in the fight