link corresponding to plugin not part of robot model

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I am able to run the multi robot scenario example from the gazebo_plugins ROS pkg (indigo-devel branch) without a problem.

However, in the gui, there is no Model Link corresponding to the camera sensor as I would expect. All other links are shown, just not the plugin link. The camera sensor link is published correctly in ROS.

Looking at the camera.xacro, the pattern (link tags followed by gazebo tags with the same name) seems to be the same as for those links which do show as part of the robot model.

Anything I'm missing?

<link name="${name}">
  <inertial>
    <mass value="1e-5" />
    <origin xyz="0 0 0" rpy="0 0 0"/>
    <inertia ixx="1e-6" ixy="0" ixz="0" iyy="1e-6" iyz="0" izz="1e-6" />
  </inertial>
  <visual>
    <origin xyz="0 0 0" rpy="0 1.57 0"/>
    <geometry>
      <cylinder radius="0.03" length="0.1"/>
    </geometry>
    <material name="grey"/>
  </visual>
  <collision>
    <origin xyz="0 0 0" rpy="0 1.57 0"/>
    <geometry>
      <cylinder radius="0.03" length="0.1"/>
    </geometry>
  </collision>
</link>
<gazebo reference="${name}">
  <material value="Gazebo/Grey"/>
</gazebo>