His strength and speed should be within human limits, so I don't think he'll do too well. No flashy moves that make use of Youki channelling for him.

That parasite infection might have given him a little gift though.. His back was conveniently covered so it's only our guess. But since he's feeling fine at the moment, either:

1) The organisation extracted it (highly likely)
2) The organisation developed the technique to harness the body-control ability and were kind enough to relinquish Rakki of it. (unlikely)
3) The parasite no longer functions malignantly as the main body's been absorbed by Claire and is now dormant (who knows...)