Well, according to his bio on smokingpipes.com, Paul started carving pipes in 2004. By then, I already had more than a few of my wax drip pipes in circulation. So...
Did I invent the style? I dunno, but I didn't copy anyone else.
Did I make wax drip pipes before Paul? I think so, by virtue of the time line.
Did Paul copy copy it from me or someone else? Well, I guess that would be a question for him. It's entirely possible that he came up with the same idea without having seen it before, and therefore 'also' invented it, kinda. Great minds think alike, you know!
At the end of the day, I don't know that it matters too much who 'invented' it. I guess that anyone who can pull it off, copied or not, deserves credit for a job well done!