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Regarding your first question, Kobuki has a built-in gyro. The gryo is used to determine the robot's rotation, since it is much more reliable then using the wheels' encoder output difference.

If you like to disable the usage of the gyro for odometry, set the use_imu_heading to false in kobuki_node/param/base.yaml (https://github.com/yujinrobot/kobuki/blob/hydro-devel/kobuki_node/param/base.yaml).

And regarding your second question, yes, you can use robot_pose_ekf to use the data from your extra gyro for gmapping. Just make sure your remap the topics accordingly.