You posed an interesting question that got me thinking. What was my theory? In this actual case my theory is based mostly from what I've read in the the lure making books I have. From what I gather both of these ingredients are top shelf ingredients in predator lures. Based off the formulations in these books I see where civet is used both in food base lures and gland based lures. What little I can gather on tonquin is it will improve a lot of different formulations. So I went for it. But as a beginner at this stuff I find the knowledge of truthful theories on lure making intriguing. Such as which side odors work together, which side odors work with which base materials, what chemical compounds cause which reactions and just as important why. But I also find it the most difficult information to gain. Either because some people don't know it to share with you, or the ones that do know value it to much to pass it out freely ( which I can understand) or they know the best way is to learn it is on your own. Anyway I have to start somewhere. I don't necessarily want to just learn the recipe to a good lure but I want to learn the "theories" of making good lures. I may never get beyond the elementary grade in this learning but so far I'm enjoying it. I work at picking bits and pieces here and there so I have a starting point to built these theories from. For example I think Lazarus mentioned on here that he added rotten down rattle snake to his cat urine to liven it up. Now my first thought is are there other rotten down materials that will add attraction to urine or is there a key chemical compound in rattlesnake that makes it work, or will this work for coyotes and coyote urine also. Another bit I learned on here from one of the legends (I think it was Asa But don't quote me) was that rotten down muskrat glands causes the most intense digging reaction of anything they had worked with. I could name many different things that I have picked up on but there are still a lot of gaps to fill in for myself and that's the challenge I enjoy. Just thoughts from a beginner.