I can't say this enough...you are fine....You are worrying about something that most brewers do all the time...at least once in every brewer's life he can't get pellets ad uses whole....many use whole exclusively (lucky bastiges), and you don't need to do anything different with them....
and it's still common practice to dump everything in the fermenters...you will find that 50% of the brewers on here dump everything in, including me sometimes.
And a great many of them (myself included) leave our beers in primary for 1 month.
I have left whole hops in my primary for a month...besides all the OTHER FACTORS which you discounted as having no effect, they go in sterile from the boil, they sit in sterile wort in sanitized liguid which contains no oxygen since it's boiled. and not to soon after the yeast starts working, any oxygen in there from shaking or using an airstone, is removed, so very rapidly it becomes an anaerobic environment once again...So no, the leaves will NOT break down....no, they won't contribute any more off flavors than pellets, which are really nothing more than leaves smushed into a mold....if you've every rehydrated them in water, you will find that many particles rehydrate into leaves anyway....
Just relx....everything is going to be fine....