According to this post, http://forums.digitalpoint.com/showthread.php?t=2162997#post16171048, when there is a large discrepancy between a particular allin search for a particular keyword and the regular search of that keyword, certain points can be drawn as to why your page isn't ranking as high as you'd like. For example, I have a keyword I rank 3rd on Google. For the operators allinanchor, allintext, allintitle, I also rank around 3rd. But for allinurl, I couldn't even find my page. Can I conclude there is something Google doesn't like something about my url?