Luftstalag14
Culé de Celestial Empire
Maybe his injury isn't fully healed, maybe he still isn't fit. And maybe it's mental - he is afraid if he runs too much he'll reinjury himself.
But he has been like that for several seasons, even before he got injured. I don't believe being static is the right strategy for avoiding injury.
Again, nobody is asking him to run like crazy. Just be more available.