For the Bayer to RGB routine:
Pad Templates:
  SRC template: 'src'
    Availability: Always
    Capabilities:
      video/x-raw-rgb
                    bpp: 32
                  depth: 32    <-------******
             endianness: 4321  <-------******
               red_mask: 16711680
             green_mask: 65280
              blue_mask: 255
             alpha_mask: -16777216
                  width: [ 1, 2147483647 ]
                 height: [ 1, 2147483647 ]
              framerate: [ 0/1, 2147483647/1 ]

and for the display routine:
Pad Templates:
  SINK template: 'sink'
    Availability: Always
    Capabilities:
      video/x-raw-rgb
              framerate: [ 0/1, 2147483647/1 ]
                  width: [ 1, 2147483647 ]
                 height: [ 1, 2147483647 ]


This (should) imply that the display can take any "depth", but (according to the dump) IT LIES!!!!