Funny thing was over the last 20 games, after the TDL, Yandle really wasn't that bad. Not good, but not terrible.
xGF 47.35, xGFrel -1.49, 1.15 pp/60 (5x5), PP xGF/60: 10.87
One reason may be he only played 15 of those 20 games, i.e., with rest he got a little bounce back in his legs.
Another reason was he was paired with young D-men who could actually skate:
Yandle - Zamula 47 minutes, xGF 59.53%
Yandle - Attard 41 minutes xGF 55.56%
42 minute with Seeler and Connauton, xGF 26% or so
Yandle might have worked out if there wasn't the streak and if they had someone to pair with him on his right side who could cover for his old legs. Even if Ellis was healthy, not sure Braun was the right partner for him.