Do both hinds present this way or only the right?
If both, then I would still lean to DSLD based only on pics w/o foot in hand.
If only in one foot/leg, then most likely not DSLD but a flexural deformity due to inlury. Most likely in the suspensory apperatus.
Still isn't a club foot and horse isn't sound, reguardess of being jumped or not.