what are you citing there? I cannot find any articles that suggest long periods of submersion - only that there WERE submersions
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
Without the assumption of this extinction event, the story is simply this: "There are rails on this island. And, there are fossils of rails on this island."