I was hoping someone would save me the searching and link me directly to relevant papers. I think the article should have done it itself, as the assumption is r

I was hoping someone would save me the searching and link me directly to relevant papers. I think the article should have done it itself, as the assumption is rather fundamental to the whole theory. Similarly I didn't see any mention of intermediate evolutionary stages being found for either a case 1 or 2? If someone sees a paper that does that, it'd be cool