I was just going to post that I finally figured that out. The showcase template is designed to show the latest blog post on that page and I just didn't understand that. None of my other static pages show blog posts so why not make my front page be just like them?
However, I'm so dumb I just figured out where that lovely big pic of the flower on the Duster info page came from. I kept thinking it was suppose to be the header or something. When I made a blog post my featured post and gave the post a featured image, presto-the pic turned up on my showcase page and I still had my header! Alleluia! (I can say that until Wed)
So I'm going to keep the showcase page and write a post that is a short intro to the blog page and then give that post a nice large featured image. Then it will serve as an intro to my blog on both pages and make the front page look cooler with the big pic. Finally I understand what they were trying to explain about the showcase template and what made it special!
But thanks anyway. I appreciate the answer. This is a lot harder than I thought it would be. I know nothing about web pages.