Did he actually plays in the national team as SB? For Bochum I haven't seen him on the side in the defence.
Only during his first caps, also played there a couple of times when he was playing for Nice and Bastia in France. When playing an SB he wouldn't be much of use in attack and would be primarily focusing on defensive tasks although his crossing and technical abilities are pretty good.
He is a very solid CB but prone to mistakes at times. He always goes forward during corners/free kicks scoring a couple of times thanks to his aerial abilities and decent positional sense.