yes, he's correct that blood is made in bone marrow.....
and that DOES make sense for those areas to heal faster.....but like, when kimimaro wasnt even using the curse seal, he ripped through his shoulder and hit healed right back.....but there was also that time, when he came out of the desert funeral, and like the lower left corner of his face was missing.....

i'd like to know how his healing powers relate to kabuto, tsunade, and kyubi naruto's