This is serendipitous as I was planning on fining in the fermenter for the first time: questions were in order.
Thanks guys for a concise take on the techniques.
My thinking is that the hot gelatin solution in necessary in order to spread (it) out over the entire surface of the beer, cool, then drop thus sweeping the haze, particles and yeast along with it. But my grasp is loose on this sort of fining and not sure if +/- attraction is relevant as well.