I don't know how many times I've discussed this in threads...but here goes again...
No-one knows! EE is such a new program that no-one has obtained PR yet through EE. Until people start obtaining PR and reporting back, there will continue to be so many grey areas.
Regarding POF, all we know is that we need to show the minimum funds requirement and that we need to provide 6 months average balance evidence in our bank account.
My personal opinion, having researched as much as I can, is that whilst we have to show 6 months average balance evidence, we do NOT require to have the full minimum balance for 6 months. I believe that the purpose of 6 months average balance is to highlight any months with large deposits (eg low balance for 5 months and then large deposit of the minimum funds in month 6). This would then raise flags with CIC who would likely ask for further evidence (bank statements) to establish why the balance increased so dramatically.
As far as I am concerned, all you need to be concerned about is a) having the minimum funds at the time of responding to the ITA and b) being able to prove that any large balances are legitimate balances and not loans.
This is just my opinion and no doubt there will be many other people on here with differing opinions.
Until we start seeing people getting PR, that is all we have.