Ok, you claim to know all of these facts through observation but it is just that, observation. Until you compile a large amount of statistics there is going to be doubt. Since when have greyed out heroes magically stolen loot? I honestly do not think leechers have any effect on drops(other than thieving coins), but again, that is just my opinion.
Making all these conclusions is just like the whole lockpick retention rate dilemna going on a few months ago. I could retain 20 lockpicks in a row with a 40% retention rate, but that doesnt mean my percentage is wrong because this is a fairly small sampling. The same goes for drop rate based on party size - you may observe that while in an eight man team you got double the regular drops than usual and jump to the conclusion that more people out of range=more drops.
If you can prove this with a large, detailed study maybe you can validate your points but otherwise all of your statements are merely assumptions.
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hope I made sense lol...