Ge tting back to the content.
One of the reasons I was having trouble understanding what you were talking about was I was looking at the sample page on my iPad.
You see, the banner you’re talking about “hero and locked to background” is using CSS to create The Parallax scrolling effect (“locked to the background”).
background-attachment: fixed;
Just to let you know that doesn’t work on most mobile devices. That means depending on your market about half your visitors will just see banner scroll normally.