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ros::init() needed for ROS Gazebo plugin?

After reading this thread on the Gazebo-list about plugins residing inside the Gazebo ROS node, I found out that my plugin is running fine without the ros::init() call.

The tutorials (e.g. here for 1.3) however make use of this initialisation. So now I wonder, if it is necessary or not?

Since, the plugin is loaded into the Gazebo node, it would make sense to me, that ros::init is not needed (similar to nodelets in ROS).