flow back

I have a question, with most of the injected fluid (pumped under
Extreme pressure) in the mid-lower formations still in place after about 2 months or so, will this
1 - benefit the frac program as the fractures have been able to stay open longer with fluid still in place and gas pressure building up and up down there until the plugs are drilled (this is my uneducated assumption of what is going on), I assume if this is the case the pressure build up would be causing even more fraccing to have taken place since being plugged , and it will absolutely explode when the plugs are drilled?
2 - no difference to if it was flowed back immediately after frac or months later
3 - somehow the fluid being trapped down there for so long being a negative

I'm sure it's crossed other peoples minds if the fluid that is still in place is a benefit or not after all this time

Thoughts?