Glad the video helped. Regarding the query –
Showcase slides are used in Nivo and Flex Sliders. Nivo Slider and Flex sliders exist just to provide a lightweight option to the users for sliders. Many users do not need the layering, animations and many other premium features that Revolution Slider provides. These features could be overkill for certain types of businesses(medical is one example) that are more information based and less creative in presentation. Flex or Nivo is easy to setup, responsive and perform well. Hope this helps.