haha not everything has to be related to bacteria. You always want to try so hard to relate whatever we are talking about to your current hypothesis, which happens to be bacteria right now. If anything, I would assume bacteria would thrive more easily under moist conditions. And also I do not have nor have I ever had cracks in my lips while Ive had EC.
For my case, personally, I wonder whether EC may not actually be caused by a wound per say, but perhaps the outer most layer of skin has been somewhat damaged after a year of peeling the skin off.
So perhaps I have treated the majority of the inflammation but the outermost layer of skin is somewhat damaged and perhaps thats why the Biafine/moisture has felt good.