I just read the article. I agree with some of Nail's points on ethics (especially his implicit or explicit criticism of too much focus on static / katastematic ideas) but I am not seeing the profound differences between Lucretius and Epicurus that he claims to see as to particles or the resulting nature of the universe.
In fact I don't think his article gives a clear statement of where he is going with his whole argument. He seems to think there are profound implications in Lucretius deviating from Epicurus - but so far as I can tell he is not explaining what significance there is in what he is seeing.
I gather he is focusing on implications of motion but I see no reason why what he talks about as to motion is not already in Epicurus.
The article has lots of energetic argument but at least for me I don't see why he is so worked up.
Eikadistes I know you have written recently on this. What so you see to be the implications of his argument?