Mmh, his passing was never really extremely outstanding, in my eyes Frings never had abilities you would call world class. But especially at his best times he was something like a complete package with nearly no real weaknesses at all. Additionally with an outstanding never-give-up mentality.
His passes are ok, but not very precise or always with the perfect speed. And with the current stats he is not bad in comparison to other defensive midfielders in the Bundesliga, Van Bommel for instance.
with Aggression 73 and Mentality 84 he still would play much deeper than before
I think he does play much deeper than in the past now. A few years ago he played very offensive, but since Baumann is not playing anymore he has to concentrate on the defence as Hunt and Özil in front of him play very offensive. Maybe he also plays a bit more defensive because his stamina is not the same like when he was 29 anymore.
His shooting is not easy to rate these days, as he hardly shoots on the goal. In the past he was a very good scorer from the distance. But I think with such a high SP and still decent ST and SA (for a defensive midfielder) you will still be able to do some dangerous shots on the goal with him in PES.