That EL run was probably his career peak, and maybe that's the best Frankfurt do in Europe for 20 years. He's a good player but I don't think you can expect him to be a key player. If he had more attacking license and we committed more players into the box then yeah he'd have more assists but I only saw him as a squad player.
I really enjoyed watching him in the EL for Frankfurt. Surprised at his apparent lack of grinta for us. He's probably just as jaded as everyone else, or maybe his legs are just not what they were.