No, having each panel be that smart would be way too expensive. Not knowing the Sphere's specific setups, typical concert/stage setups have "dumb" panels are just screens with no bezel so they can be positioned edge to edge in what ever configuration for size/shape you need. After that, they are all connected back to a central system to control the signals to each of the screens.
Also, loading the content to each "smart" panel as you describe would be an absolute nightmare, and very time consuming. That's not how a roadie thinks.
Also, loading the content to each "smart" panel as you describe would be an absolute nightmare, and very time consuming. That's not how a roadie thinks.