The addition does an excellent job of laying the ground work for the relationship between natural selection and speciation However introducing this much detail into the introductory paragraphs of an introductory article may be defeating the purpose The introduction went through literally hundreds of edits before a consensus was reached thus I am a tad nervous as to the outcome of such a dramatic expansion Excessive details in the lead are to be discouraged Sentences such as this The advantage of one trait over another can be a sign of adaptation which means that the functional utility of that trait is causing it to spread more rapidly than other competing traits The challenge has always been saying more with less